GB3087 is a Chinese national standard that specifies the technical requirements for seamless steel tubes used in the manufacture of low and medium pressure boilers.

GB3087是中國國家標(biāo)準(zhǔn)，規(guī)定了制造中低壓鍋爐用無縫鋼管的技術(shù)要求。

GB3087 standard covers a range of seamless carbon steel tubes with various grades, including 10#, 20#, and other low-alloy materials. The tubes are used in the construction of boilers, heat exchangers, and pressure vessels for conveying steam, water, and other fluids at temperatures up to 450°C, and pressures up to 5.88 MPa.

GB3087標(biāo)準(zhǔn)涵蓋了各種等級的無縫碳鋼管，包括10#、20#和其他低合金材料。這些管子用于建造鍋爐、熱交換器和壓力容器，用于輸送溫度高達(dá)450°C、壓力高達(dá)5.88 MPa的蒸汽、水和其他流體。

The GB3087 standard specifies the chemical composition, mechanical properties, and other technical requirements for the seamless steel tubes. For example, the standard requires that the tensile strength of the tubes should be no less than 410 MPa, and the yield strength should be no less than 245 MPa, as per [3]. In addition, the standard also sets out the testing methods and inspection requirements for ensuring the quality of the tubes.

GB3087標(biāo)準(zhǔn)規(guī)定了無縫鋼管的化學(xué)成分、力學(xué)性能等技術(shù)要求。例如，標(biāo)準(zhǔn)要求管材的抗拉強(qiáng)度應(yīng)不低于410 MPa，屈服強(qiáng)度應(yīng)不小于245 MPa，如[3]所述。此外，該標(biāo)準(zhǔn)還規(guī)定了確保管材質(zhì)量的測試方法和檢驗(yàn)要求。

GB3087 is an important standard for the manufacturing of seamless steel tubes used in low and medium pressure boilers in China, ensuring that these tubes meet the necessary technical requirements and quality standards.

GB3087是我國中低壓鍋爐用無縫鋼管制造的重要標(biāo)準(zhǔn)，確保這些鋼管符合必要的技術(shù)要求和質(zhì)量標(biāo)準(zhǔn)。

Scope范圍

This standard specifies the dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality specifications of seamless steel tubes for low and medium pressure boilers.

本標(biāo)準(zhǔn)規(guī)定了中低壓鍋爐用無縫鋼管的尺寸、形狀、重量、技術(shù)要求、試驗(yàn)方法、檢驗(yàn)規(guī)則、包裝、標(biāo)志和質(zhì)量規(guī)范。

This standard is applicable to the manufacture of high-quality carbon structural steel hot-rolled (extruded, expanded) and cold drawn (rolled) seamless steel tubes for various structural low-pressure and medium-pressure boilers and locomotive boilers.

本標(biāo)準(zhǔn)適用于各種結(jié)構(gòu)低壓、中壓鍋爐和機(jī)車鍋爐用優(yōu)質(zhì)碳素結(jié)構(gòu)鋼熱軋（擠壓、膨脹）和冷拔（軋制）無縫鋼管的制造。

Reference standard參考標(biāo)準(zhǔn)

The provisions contained in the following standards constitute provisions of this standard by reference in this standard. At the time of publication, the editions indicated were valid. All standards will be revised and parties using this standard should explore the possibility of using the latest version of the following standards.

下列標(biāo)準(zhǔn)中的規(guī)定通過在本標(biāo)準(zhǔn)中引用而構(gòu)成本標(biāo)準(zhǔn)的規(guī)定。在出版時(shí)，所示版本是有效的。所有標(biāo)準(zhǔn)都將被修訂，使用本標(biāo)準(zhǔn)的各方應(yīng)探索使用以下標(biāo)準(zhǔn)最新版本的可能性。

• GB/T222—1984 Sample sampling method for chemical analysis of steel and chemical composition tolerance of finished products·
• GB/T222--1984鋼材化學(xué)分析取樣方法及成品化學(xué)成分允許偏差
• GB/T223.5-1997 Methods for chemical analysis of steels and alloys - Determination of acid-soluble silicon content by molybdate spectrophotometry·
• GB/T223.5-1997鋼及合金化學(xué)分析方法鉬酸鹽分光光度法測定酸溶硅量
• GB/T 223.12—1991 Methods for chemical analysis of steels and alloys - Sodium carbonate - Diphenylcarbonyl hydrazide photometric method·
• GB/T 223.12--1991鋼及合金化學(xué)分析方法碳酸鈉二苯羰基酰肼光度法
• GB/T 223.19—1989 Chemical analysis methods for steel and alloys Xinyatongling-trichloromethane extraction·
• GB/T 223.19—1989鋼鐵及合金化學(xué)分析方法新牙嶺三氯甲烷萃取法
• GB/T 223.23—1994 Methods for chemical analysis of steels and alloys - Determination of nickel content by succinimide spectrophotometry·
• GB/T 223.23--1994鋼及合金化學(xué)分析方法丁二酰亞胺分光光度法測定鎳量
• GB/T 223.62—1988 Methods for chemical analysis of steels and alloys - Determination of phosphorus content by butyl acetate extraction spectrophotometry·
• GB/T 223.62-1988鋼及合金化學(xué)分析方法乙酸丁酯萃取分光光度法測定磷量
• GB/T 223.63—1988 Methods for chemical analysis of steels and alloys - Determination of manganese content by sodium periodate (potassium) photometric method·
• GB/T 223.63-1988鋼及合金化學(xué)分析方法高碘酸鈉（鉀）光度法測定錳量
• GB/T 223.69—1997 Method for chemical analysis of steel and alloys. Determination of carbon content by gas volume method after combustion in tubular boilers·
• GB/T 223.69-1997鋼及合金化學(xué)分析方法。管式鍋爐燃燒后氣體體積法測定碳含量
• GB/T 223.72—1991 Methods for chemical analysis of steels and alloys - Aluminium chromatographic separation - Barium sulfate gravimetric method·
• GB/T 223.72-1991鋼及合金化學(xué)分析方法鋁色譜分離硫酸鋇重量法
• GB/T 226—1991 Low-fold structure of steel and defect acid etching test·
• GB/T 226--1991鋼的低折組織和缺陷酸蝕試驗(yàn)
• GB/T 228—1987 Metal tensile test method·
• GB/T 228--1987金屬拉伸試驗(yàn)方法
• GB/T 241—1990 Metal pipe hydraulic test method·
• GB/T 241--1990金屬管水壓試驗(yàn)方法
• GB/T 242—1997 Metal pipe flaring test method·
• GB/T 242--1997金屬管擴(kuò)口試驗(yàn)方法
• GB/T 244—1997 Metal tube bending test method·
• GB/T 244--1997金屬管材彎曲試驗(yàn)方法
• GB/T 245—1997 Metal tube crimping test method·
• GB/T 245--1997金屬管壓接試驗(yàn)方法
• GB/T 246—1997 Metal tube flattening test method·
• GB/T 246--1997金屬管壓扁試驗(yàn)方法
• GB/T 699—1999 high quality carbon structural steel·
• GB/T 699--1999優(yōu)質(zhì)碳素結(jié)構(gòu)鋼
• GB/T 2102—1988 Acceptance, packaging, marking and quality instructions for steel pipes·
• GB/T 2102—1988鋼管的驗(yàn)收、包裝、標(biāo)志和質(zhì)量說明
• GB/T 5777-1996 Ultrasonic flaw detection test method for seamless steel tubes·
• GB/T 5777-1996無縫鋼管超聲波探傷試驗(yàn)方法
• GB/T 7735-1995 Steel pipe eddy current testing method·
• GB/T 7735-1995鋼管渦流檢測方法
• GB/T 12606—1999 Steel pipe leakage magnetic flaw detection method·
• GB/T 12606--1999鋼管漏磁探傷方法
• GB/T 17395—1998 Seamless steel pipe size, shape, weight and tolerance·
• GB/T 17395--1998無縫鋼管尺寸、形狀、重量及允許偏差
• YB/T 5222-1993 high quality carbon round billet·
• YB/T 5222-1993優(yōu)質(zhì)碳素圓坯

size, shape, weight尺寸、形狀、重量

1 Outer diameter and wall thickness

1外徑和壁厚

1. 1. The outer diameter, wall thickness and theoretical weight of the steel pipe shall comply with the provisions of Table 1 of GB/T 17395-1998.

1.1鋼管的外徑、壁厚和理論重量應(yīng)符合GB/T 17395-1998表1的規(guī)定。

Steel pipes of different specifications as specified in Table 1 of GB/T 17395-1998 may be supplied through negotiation between the supplier and the buyer.

GB/T 17395-1998表1中規(guī)定的不同規(guī)格的鋼管可由供應(yīng)商和買方協(xié)商提供。

1. 2. The allowable deviation of the outer diameter and wall thickness shall comply with the requirements of Table 1.

1.2外徑和壁厚的允許偏差應(yīng)符合表1的要求。

When the purchaser requests to supply according to advanced precision, it should be indicated in the contract.

當(dāng)買方要求按照先進(jìn)精度供貨時(shí)，應(yīng)在合同中注明。

After consultation between the supplier and the buyer, and in the contract, it can produce steel pipes with deviations from those specified in Table 1.

供需雙方協(xié)商，在合同中，可以生產(chǎn)與表1中規(guī)定的偏差的鋼管。

GB 3087 Standard Seamless Boiler Alloy Steel Pipe Low Pressure Medium Pressure  GB 3087標(biāo)準(zhǔn)無縫鍋爐合金鋼管低壓中壓

Table 1 Allowable deviation of outer diameter and wall thickness表1外徑和壁厚的允許偏差

 

Chemical Composition(%) of GB 3087  GB 3087化學(xué)成分（%）

Standard	Steel Grade	C	Si	Mn	S	P	Cr
GB 3087	10	0.07-0.13	0.17-0.37	0.35-0.65	0.020	0.025	≤0.15
	20	0.17-0.23	0.17-0.37	0.35-0.65	0.020	0.025	≤0.25

2 length長度

2.1 Normal length正常長度

The usual length of steel pipes is specified as follows:鋼管的常用長度規(guī)定如下：

Hot-rolled (extruded, expanded) steel pipe............................................................4000~12000mm;

熱軋（擠壓、膨脹）鋼管............................................................4000~12000mm；

Cold drawn (rolled) steel pipe.................................................................. 4000~10500mm.

冷拔（軋）鋼管.................................................................. 4000~10500mm。

After consultation between the supplier and the buyer, the steel pipe with a length of not less than 3000mm can be delivered, but the weight must not exceed 5% of the total delivery weight of the batch of steel pipes.

經(jīng)供需雙方協(xié)商，長度不小于3000mm的鋼管可以交付，但重量不得超過該批鋼管總交付重量的5%。

2.2 Length and length of the ruler尺子的長度和長度

The length of the fixed length and the length of the double scale should be within the normal length range, and the full length tolerance is mm.

定尺長度和雙尺長度應(yīng)在正常長度范圍內(nèi)，全長公差為mm。

The length of each double ruler is set as follows:

每把雙尺的長度設(shè)置如下：

OD ≤ 159mm..................................................................5~10mm;

 2.3 Range length

The length of the range should be within the usual length range.

范圍的長度應(yīng)在通常的長度范圍內(nèi)。

3 Bending彎曲

The bending of the steel pipe shall not be greater than the following:

鋼管的彎曲度不得超過以下數(shù)值：

Wall thickness ≤ 15mm..................................................................1.5mm/m;

Wall thickness >15mm..................................................................2.0mm/m;

Thermal expansion tube with an outer diameter of ≥ .................... 3.0mm/m.

4 tip shape尖端形狀

The end faces of the steel pipe should be perpendicular to the axis of the steel pipe, and the burrs of the cut should be removed.

鋼管的端面應(yīng)垂直于鋼管的軸線，并應(yīng)去除切口的毛刺。

5 Unroundness and uneven wall thickness不圓度和壁厚不均勻

According to the requirements of the purchaser, the supplier and the buyer shall negotiate and indicate in the contract that the out-of-roundness and wall thickness of the same section of steel shall not exceed 80% of the outer diameter and wall thickness, respectively.

根據(jù)買方的要求，供應(yīng)商和買方應(yīng)協(xié)商并在合同中注明，同一截面鋼的不圓度和壁厚不得分別超過外徑和壁厚的80%。

6 Delivery weight交貨重量

The delivery weight of steel pipes shall comply with the provisions of GB/T 19395. The density of the steel is calculated as 7.85 kg/dm3.

鋼管的交貨重量應(yīng)符合GB/T 19395的規(guī)定。鋼的密度計(jì)算為7.85kg/dm3。

7 Tag example標(biāo)簽示例

A steel pipe with an outer diameter of 76 mm and a wall thickness of 3.5 mm made of steel No. 10:

由10號鋼制成的外徑為76mm、壁厚為3.5mm的鋼管：

1. Hot-rolled steel pipe, the outer diameter and wall thickness are of ordinary grade accuracy, and the length is 3000mm.

a） 熱軋鋼管，外徑和壁厚為普通級精度，長度為3000mm。

10-76×3.5×3000 times—GB 3087—1999

2. Cold drawn (rolled) steel pipe, the outer diameter is advanced precision, the wall thickness is ordinary precision, and the length is 5000mm

b） 冷拔（軋）鋼管，外徑精度先進(jìn)，壁厚精度一般，長度5000mm

Cold 10-76 high × 3.5 × 5000 times - GB 3087-1999

Technical requirements技術(shù)要求

1 Steel grades and chemical composition

1鋼種和化學(xué)成分

Table 2 Chemical composition of steel pipes

表2鋼管化學(xué)成分

Standard issuing unit: National Quality and Technical Supervision Bureau approved 1999-11-01

標(biāo)準(zhǔn)發(fā)布單位：國家質(zhì)量技術(shù)監(jiān)督局批準(zhǔn)1999-11-01

Implementation date: 2000-08-01 implementation

實(shí)施日期：2000年8月1日實(shí)施

1. 1. The steel pipe is made of steel No. 10 and No. 20, and the chemical composition (melting analysis) shall comply with the provisions of GB/T 699. The steel pipe is inspected according to the olefinic components.

1.1鋼管由10號和20號鋼制成，化學(xué)成分（熔融分析）應(yīng)符合GB/T 699的規(guī)定。鋼管根據(jù)烯烴成分進(jìn)行檢驗(yàn)。

1. 2. When the requester requests the analysis of the finished product, it should be indicated in the contract.

1.2當(dāng)請求者要求對成品進(jìn)行分析時(shí)，應(yīng)在合同中注明。

The chemical composition allowable deviation of the finished steel pipe shall comply with the provisions of GB/T222.

成品鋼管的化學(xué)成分允許偏差應(yīng)符合GB/T222的規(guī)定。

2 Manufacturing methods制造方法

2.1 Method of manufacturing steel2.1鋼材制造方法

Steel shall be manufactured by electric furnace, oxygen converter or open hearth method. When the manufacturer specifies a certain manufacturing method, it shall be indicated in the contract; the steel directly used for continuous casting billet must be refined outside the furnace.

鋼材應(yīng)采用電爐、氧氣轉(zhuǎn)爐或平爐法制造。當(dāng)制造商指定某種制造方法時(shí)，應(yīng)在合同中注明；直接用于連鑄坯的鋼必須在爐外精煉。

2.2 Manufacturing method of tube blank管坯制造方法

The tube blank can be produced by a hot rolling method, and a continuous casting billet or a steel ingot can also be used. Hot rolled tube blanks shall comply with the provisions of YB/T 5222.

管坯可以通過熱軋方法生產(chǎn)，也可以使用連鑄坯或鋼錠。熱軋管坯應(yīng)符合YB/T 5222的規(guī)定。

2.3 Manufacturing method of steel pipe鋼管制造方法

The steel pipe can be manufactured by a hot rolling (extrusion, expansion) or cold drawing (rolling) seamless method. When the purchaser specifies a certain manufacturing method, it should be indicated in the contract.

鋼管可以通過熱軋（擠壓、膨脹）或冷拔（軋制）無縫方法制造。當(dāng)買方指定某種制造方法時(shí)，應(yīng)在合同中注明。

3 Delivery status交貨狀態(tài)

Steel pipes shall be delivered in hot rolled or heat treated condition. The finishing temperature of the steel pipe delivered in the hot rolled state shall not be less than Ar3.

鋼管應(yīng)在熱軋或熱處理狀態(tài)下交付。熱軋狀態(tài)下交付的鋼管的終軋溫度不得低于Ar3。

4 Mechanical properties機(jī)械性能

4.1 Delivery conditions The longitudinal mechanical properties of steel pipes are to comply with the requirements of Table 3.

4.1交貨條件鋼管的縱向力學(xué)性能應(yīng)符合表3的要求。

Table 3 Longitudinal mechanical properties of steel tubes鋼管縱向力學(xué)性能

Standard	Steel pipe	Wall thickness (mm)	Tensile strength (MPa)	Yield Strength (MPa)	Elongation %
				≥
GB3087	10	/	335-475	195	24
	20	＜15	410-550	245	20
		≥15		225

4.2 The high-temperature transient performance of the steel pipe used for medium-pressure boiler superheated steam pipe shall comply with the provisions of Table 4. The purchaser shall indicate the purpose of the steel pipe in the contract.

4.2中壓鍋爐過熱蒸汽管道用鋼管的高溫瞬態(tài)性能應(yīng)符合表4的規(guī)定。買方應(yīng)在合同中注明鋼管的用途。

According to the requirements of the purchaser, the supplier and the buyer shall negotiate and indicate the test temperature in the contract, and the supplier shall provide the actual high-temperature transient performance data of the steel pipe.

根據(jù)買方的要求，供應(yīng)商和買方應(yīng)協(xié)商并在合同中注明試驗(yàn)溫度，供應(yīng)商應(yīng)提供鋼管的實(shí)際高溫瞬態(tài)性能數(shù)據(jù)。

Table 4 Minimum yield strength of steel pipe at high temperature高溫下鋼管的最小屈服強(qiáng)度

Steel grade	Sample status	Temperature，℃
		200	250	300	350	400	450
10	Delivery status	165	145	122	111	109	107
20		188	170	149	137	134	132

5 Process test工藝試驗(yàn)

5.1 Hydraulic test水壓試驗(yàn)

The steel pipe should be hydraulically tested one by one.鋼管應(yīng)逐一進(jìn)行水壓試驗(yàn)。

The supplier can replace the hydraulic test with eddy current testing. Ultrasonic testing or magnetic flux leakage testing can also be used instead of hydraulic testing after consultation between the supplier and the buyer. When using eddy current flaw detection, the grade A hole of GB/T 7735-1994 should be used; when ultrasonic flaw detection, the depth grade of the longitudinal notch groove on the outer surface of the comparison sample tube should meet the requirements of C8 in GB/T5777-1996; The longitudinal notch groove on the outer surface of the comparative sample tube shall comply with the provisions of N12.5 in GB/T 12606-1999, with a minimum depth of 0.5 mm and a maximum depth of 1.5 mm.

供應(yīng)商可以用渦流檢測代替液壓測試。經(jīng)供需雙方協(xié)商后，也可以使用超聲波檢測或漏磁檢測代替液壓檢測。使用渦流探傷時(shí)，應(yīng)使用GB/T 7735-1994的A級孔；超聲波探傷時(shí)，對比樣品管外表面縱向切口槽的深度等級應(yīng)符合GB/T577-1996中C8的要求；對比樣品管外表面上的縱向凹槽應(yīng)符合GB/T 12606-1999中N12.5的規(guī)定，最小深度為0.5mm，最大深度為1.5mm。

5.2 Flattening test壓扁試驗(yàn)

Steel pipes with an outer diameter of more than 22mm to 400mm and a wall thickness of not more than 10mm shall be subjected to a flattening test.

外徑大于22mm至400mm、壁厚不超過10mm的鋼管應(yīng)進(jìn)行壓扁試驗(yàn)。

No cracks or cracks shall appear on the specimen after the flattening test.

壓扁試驗(yàn)后，試樣上不得出現(xiàn)裂紋。

5.3 crimping test壓接試驗(yàn)

According to the requirements of the purchaser, the supply and demand sides negotiate and indicate in the contract that the steel pipe made of No. 10 steel can be subjected to the crimping test.根據(jù)買方的要求，供需雙方協(xié)商并在合同中明確表示，10號鋼制成的鋼管可以進(jìn)行壓接試驗(yàn)。

The curling width (measured by the inner wall) shall not be less than 12% of the nominal inner diameter, nor less than 1.5 times the nominal wall thickness, and the curling angle shall be 90°. No cracks or cracks shall occur outside the sample curl after crimping.

卷曲寬度（由內(nèi)壁測量）不得小于標(biāo)稱內(nèi)徑的12%，也不得小于標(biāo)稱壁厚的1.5倍，卷曲角度應(yīng)為90°。壓接后，樣品卷曲外不得出現(xiàn)裂紋或裂紋。

5.4 Flaring test擴(kuò)口試驗(yàn)

According to the requirements of the purchaser, the supply and demand sides negotiate and indicate in the contract that the steel pipe with a wall thickness of not more than 8 mm can be subjected to a flare test with a top taper of 30°, 45° or 60°. No cracks or cracks shall appear on the specimen after flaring.

根據(jù)買方的要求，供需雙方協(xié)商并在合同中明確表示，壁厚不超過8mm的鋼管可以進(jìn)行頂部錐度為30°、45°或60°的擴(kuò)口試驗(yàn)。擴(kuò)口后試樣上不得出現(xiàn)裂紋。

The flaring ratio of the outer diameter of the sample after flaring shall comply with the requirements of Table 5.

擴(kuò)口后樣品外徑的擴(kuò)口比應(yīng)符合表5的要求。

Table 5 steel pipe outer diameter expansion rate鋼管外徑膨脹率

Standard	Steel grade	steel pipe outer diameter expansion rate，%
		Inside diameter / outer diameter
		≤0.6	＞0.6-0.8	＞0.8
GB3087	10	12	15	19
	20	10	12	17

5.5 Bending test彎曲試驗(yàn)

Steel pipes with an outer diameter of not more than 22 mm shall be subjected to a bending test with a bending angle of 90° and a radius of curvature of six times the outer diameter of the steel pipe. There must be no cracks or cracks in the bend.

外徑不超過22mm的鋼管應(yīng)進(jìn)行彎曲試驗(yàn)，彎曲角度為90°，曲率半徑為鋼管外徑的六倍。彎曲處不得有裂縫或裂紋。

According to the requirements of the purchaser, the supply and demand sides negotiate and indicate in the contract that the steel pipe for the locomotive boiler can be bent. The bending angle and the radius of the core are negotiated by both the supplier and the buyer.

根據(jù)買方的要求，供需雙方協(xié)商并在合同中明確表示，機(jī)車鍋爐的鋼管可以彎曲。彎曲角度和芯半徑由供應(yīng)商和買方協(xié)商確定。

6 Low-power test低功率試驗(yàn)

For steel pipes directly manufactured by continuous casting billet or steel ingot, the supplier shall ensure that there are no white spots, inclusions, slag inclusions, skin turning, delamination and subcutaneous air bubbles on the cross-section acid-leaching low-strength test piece of the steel pipe or the blank.

對于直接由連鑄坯或鋼錠制造的鋼管，供應(yīng)商應(yīng)確保鋼管或毛坯的橫截面酸浸低強(qiáng)度試件上沒有白點(diǎn)、夾雜物、夾渣、表面車削、分層和皮下氣泡。

7 Surface quality表面質(zhì)量

The inner and outer surfaces of the steel pipe are not allowed to have cracks, folds, creases, crusting or separation, and these defects should be completely removed. The clearance depth shall not exceed the negative deviation of the nominal wall thickness, and the actual wall thickness at the cleaning site shall not be less than the minimum allowed by the wall.

鋼管的內(nèi)外表面不得有裂紋、褶皺、折痕、結(jié)痂或分離，這些缺陷應(yīng)完全清除。間隙深度不得超過公稱壁厚的負(fù)偏差，清洗現(xiàn)場的實(shí)際壁厚不得小于壁厚允許的最小值。

Straight road allowed depth:直道允許深度：

Cold drawn (rolled) steel pipe: not more than 4% of the wall thickness, the maximum depth is 0.3mm;

冷拔（軋）鋼管：不超過壁厚的4%，最大深度為0.3mm；

Hot-rolled (extruded, expanded) steel pipe: not more than 5% of the wall thickness, the maximum depth is 0.5mm.

熱軋（擠壓、膨脹）鋼管：不超過壁厚的5%，最大深度為0.5mm。

Other defects where the depth does not exceed the wall thickness negative deviation and the remaining wall thickness is not less than the minimum allowed by the wall thickness are allowed to exist.允許存在深度不超過壁厚負(fù)偏差且剩余壁厚不小于壁厚允許的最小值的其他缺陷。

4.8 Non-destructive testing無損檢測

According to the requirements of the purchaser, after consultation between the supplier and the buyer, and in the contract, the steel pipe can be ultrasonically tested one by one. The depth of the longitudinal notch groove on the outer surface of the sample pipe should meet the requirements of C8 in GB/T 5777-1996.

根據(jù)買方的要求，經(jīng)供需雙方協(xié)商，并在合同中，鋼管可以逐一進(jìn)行超聲波檢測。樣品管外表面縱向凹槽的深度應(yīng)符合GB/T 5777-1996中C8的要求。

Test methods試驗(yàn)方法

1 The size of the steel pipe shall be measured one by one using gauges that meet the accuracy requirements.

1鋼管的尺寸應(yīng)使用符合精度要求的量規(guī)逐一測量。

2 The inner and outer surfaces of steel pipes shall be visually inspected one by one.

2鋼管內(nèi)外表面應(yīng)逐一進(jìn)行目視檢查。

3 Other inspection items for steel pipes shall comply with the requirements of Table 6.

3鋼管的其他檢驗(yàn)項(xiàng)目應(yīng)符合表6的要求。

Table 6 Inspection items, sampling quantities and test methods for steel pipes鋼管檢驗(yàn)項(xiàng)目、取樣數(shù)量及試驗(yàn)方法

 

Inspection rules檢驗(yàn)規(guī)則

1 Inspection and acceptance檢查驗(yàn)收

The inspection and acceptance of steel pipes shall comply with the provisions of GB/T 2102.鋼管的檢驗(yàn)和驗(yàn)收應(yīng)符合GB/T 2102的規(guī)定。

2 Batch rule批處理規(guī)則

The steel pipes are inspected and accepted in batches. Each batch shall consist of steel pipes of the same grade, the same furnace (tank) number, the same specification and the same heat treatment system (heating).

鋼管分批驗(yàn)收。每批應(yīng)由相同等級、相同爐（罐）號、相同規(guī)格和相同熱處理系統(tǒng)（加熱）的鋼管組成。

All pipe sections taken from double-length long seamless steel pipes shall be considered as one.

所有取自雙倍長度長無縫鋼管的管段應(yīng)視為一個(gè)。

The number of roots of each batch of steel pipes does not exceed the following:

每批鋼管的根數(shù)不超過以下值：

The outer diameter is not more than 76mm, and the wall thickness is not more than 3mm......................................................400 PCS;

外徑不大于76mm，壁厚不大于3mm......................................................400件；

Outer diameter is greater than 351mm....................................................................................50 PCS;

外徑大于351mm....................................................................................50件；

Other sizes of steel pipes..........................................................................................200 PCS.

其他尺寸的鋼管..........................................................................................200件。

When the number of remaining steel pipes is not less than 50% as specified above, it shall be listed as a batch; if it is less than 50% of the above, it may be incorporated into the same grade, the same furnace (can) number, the same specification and the same heat treatment system (furnace) Next) in the adjacent batch.

當(dāng)剩余鋼管數(shù)量不少于上述規(guī)定的50%時(shí)，應(yīng)按批次列出；如果低于上述50%，則可以將其合并到相鄰批次中的相同等級、相同爐（罐）號、相同規(guī)格和相同熱處理系統(tǒng)（爐）Next）中。

3 Number of samples樣本數(shù)量

The sampling quantity of each inspection item of each batch of steel pipe shall be as specified in Table 6.

每批鋼管的每個(gè)檢驗(yàn)項(xiàng)目的取樣數(shù)量應(yīng)符合表6的規(guī)定。

4 Re-inspection and decision rules復(fù)檢和決策規(guī)則

The re-inspection and determination rules of steel pipes shall comply with the provisions of GB/T 2102.

鋼管復(fù)驗(yàn)判定規(guī)則應(yīng)符合GB/T 2102的規(guī)定。

Packaging, marking and quality instructions包裝、標(biāo)記和質(zhì)量說明

The packaging, marking and quality specifications of steel pipes shall comply with the provisions of GB/T 2102.

鋼管的包裝、標(biāo)志和質(zhì)量規(guī)格應(yīng)符合GB/T 2102的規(guī)定。

Test Requirement測試要求

Flattening Test壓扁試驗(yàn)

Steel Tubes With An Outer Diameter Greater Than 22 Mm And Up To 400 Mm, And Wall Thickness Greater Than 10 Mm Should Undergo The Flattening Test. After The Samples Are Flattened

外徑大于22mm至400mm、壁厚大于10mm的鋼管應(yīng)進(jìn)行壓扁試驗(yàn)。樣品壓平后

Bending Test彎曲試驗(yàn)

Steel Tubes With An Outer Diameter Not Greater Than 22 Mm Should Undergo The Bending Test. The Bending Angle Is 90o . The Bending Radius Is 6 Times The Outer Diameter Of The Steel Tube.After Bending The Sample, No Fissures Or Cracks Are Permitted To Appear On The Sample.

外徑不大于22Mm的鋼管應(yīng)進(jìn)行彎曲試驗(yàn)。彎曲角度為90度。彎曲半徑是鋼管外徑的6倍。彎曲樣品后，樣品上不允許出現(xiàn)裂縫或裂紋。

Macroscopic Examination宏觀檢查

For Steel Tubes Directly Made By Continuously Cast Billets Or Steel Ingots, The Supplying Party Should Guarantee That There Are No White Spots, Impurities, Sub-Surface Air Bubbles, Skull Patches Or Layering On The Cross-Sectional Acid Pickled Macroscopic Tissue Of The Billet Or Steel Tube.

對于直接由連鑄鋼坯或鋼錠制成的鋼管，供應(yīng)方應(yīng)保證鋼坯或鋼管的酸洗宏觀組織橫截面上沒有白點(diǎn)、雜質(zhì)、亞表面氣泡、顱骨斑或分層。

Non-Destructive Inspection無損檢測

According To The Demanding Party’s Request, Which Is Then Negotiated Between The Supplying And Demanding Parties And Indicated In The Agreement, Ultrasonic Flaw Detection May Be Individually Performed For Steel Tubes. The Longitudinal Manual Defect Of The Reference Sample Tube Should Meet The Requirements For Post-Inspection Acceptance Grade C8 Specified In GB/T 5777-1996.

根據(jù)需求方的要求，然后供需雙方協(xié)商并在協(xié)議中指出，鋼管可以單獨(dú)進(jìn)行超聲波探傷。參考樣品管的縱向手動(dòng)缺陷應(yīng)符合GB/T 5777-1996規(guī)定的C8級檢驗(yàn)后驗(yàn)收要求。

Related GB3087相關(guān)GB3087