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是中國國家標準，規定了製造中低壓鍋爐用無縫鋼管的技術要求。

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標準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。這些管子用於建造鍋爐、熱交換器和壓力容器，用於輸送溫度高達450°C、壓力高達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標準規定了無縫鋼管的化學成分、力學性能等技術要求。例如，標準要求管材的抗拉強度應不低於410 MPa，屈服強度應不小於245 MPa，如[3]所述。此外，該標準還規定了確保管材質量的測試方法和檢驗要求。

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製造的重要標準，確保這些鋼管符合必要的技術要求和質量標準。

Scope範圍

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.

本標準規定了中低壓鍋爐用無縫鋼管的尺寸、形狀、重量、技術要求、試驗方法、檢驗規則、包裝、標誌和質量規範。

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.

本標準適用於各種結構低壓、中壓鍋爐和機車鍋爐用優質碳素結構鋼熱軋（擠壓、膨脹）和冷拔（軋製）無縫鋼管的製造。

Reference standard參考標準

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.

下列標準中的規定通過在本標準中引用而構成本標準的規定。在出版時，所示版本是有效的。所有標準都將被修訂，使用本標準的各方應探索使用以下標準最新版本的可能性。

• GB/T222—1984 Sample sampling method for chemical analysis of steel and chemical composition tolerance of finished products·
• GB/T222--1984鋼材化學分析取樣方法及成品化學成分允許偏差
• 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鋼及合金化學分析方法鉬酸鹽分光光度法測定酸溶矽量
• 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鋼及合金化學分析方法。管式鍋爐燃燒後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
• GB/T 228—1987 Metal tensile test method·
• GB/T 228--1987金屬拉伸試驗方法
• GB/T 241—1990 Metal pipe hydraulic test method·
• GB/T 241--1990金屬管水壓試驗方法
• GB/T 242—1997 Metal pipe flaring test method·
• GB/T 242--1997金屬管擴口試驗方法
• GB/T 244—1997 Metal tube bending test method·
• GB/T 244--1997金屬管材彎曲試驗方法
• GB/T 245—1997 Metal tube crimping test method·
• GB/T 245--1997金屬管壓接試驗方法
• GB/T 246—1997 Metal tube flattening test method·
• GB/T 246--1997金屬管壓扁試驗方法
• GB/T 699—1999 high quality carbon structural steel·
• GB/T 699--1999優質碳素結構鋼
• GB/T 2102—1988 Acceptance, packaging, marking and quality instructions for steel pipes·
• GB/T 2102—1988鋼管的驗收、包裝、標誌和質量說明
• 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優質碳素圓坯

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、壁厚和理論重量應符合GB/T 17395-1998表1的規定。

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中規定的不同規格的鋼管可由供應商和買方協商提供。

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.

當買方要求按照先進精度供貨時，應在合同中注明。

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.

供需雙方協商，在合同中，可以蜜桃视频网站在线观看與表1中規定的偏差的鋼管。

GB 3087 Standard Seamless Boiler Alloy Steel Pipe Low Pressure Medium Pressure  GB 3087標準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.

經供需雙方協商，長度不小於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在正常長度範圍內，全長公差為mm。

The length of each double ruler is set as follows:

每把雙尺的長度設置如下：

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

 2.3 Range length

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

範圍的長度應在通常的長度範圍內。

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.

鋼管的端麵應垂直於鋼管的軸線，並應去除切口的毛刺。

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.

根據買方的要求，供應商和買方應協商並在合同中注明，同一截麵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.

鋼管的交貨重量應符合GB/T 19395的規定。鋼的密度計算為7.85kg/dm3。

7 Tag example標簽示例

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號鋼製成的外徑為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，壁厚精度一般，長度5000mm

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

Technical requirements技術要求

1 Steel grades and chemical composition

1鋼種和化學成分

Table 2 Chemical composition of steel pipes

表2鋼管化學成分

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

標準發布單位：國家質量技術監督局批準1999-11-01

Implementation date: 2000-08-01 implementation

實施日期：2000年8月1日實施

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號鋼製成，化學成分（熔融分析）應符合GB/T 699的規定。鋼管根據烯烴成分進行檢驗。

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

1.2當請求者要求對成品進行分析時，應在合同中注明。

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

成品鋼管的化學成分允許偏差應符合GB/T222的規定。

2 Manufacturing methods製造方法

2.1 Method of manufacturing steel2.1鋼材製造方法

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.

鋼材應采用電爐、氧氣轉爐或平爐法製造。當製造商指定某種製造方法時，應在合同中注明；直接用於連鑄坯的鋼必須在爐外精煉。

2.2 Manufacturing method of tube blank管坯製造方法

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蜜桃视频网站在线观看，也可以使用連鑄坯或鋼錠。熱軋管坯應符合YB/T 5222的規定。

2.3 Manufacturing method of steel pipe鋼管製造方法

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（軋製）無縫方法製造。當買方指定某種製造方法時，應在合同中注明。

3 Delivery status交貨狀態

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.

鋼管應在熱軋或熱處理狀態下交付。熱軋狀態下交付的鋼管的終軋溫度不得低於Ar3。

4 Mechanical properties機械性能

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性能應符合表3的要求。

Table 3 Longitudinal mechanical properties of steel tubes鋼管縱向力學性能

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性能應符合表4的規定。買方應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.

根據買方的要求，供應商和買方應協商並在合同中注明試驗溫度，供應商應提供鋼管的實際高溫瞬態性能數據。

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

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

5.1 Hydraulic test水壓試驗

The steel pipe should be hydraulically tested one by one.鋼管應逐一進行水壓試驗。

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.

供應商可以用渦流檢測代替液壓測試。經供需雙方協商後，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，應使用GB/T 7735-1994的A級孔；超聲波探傷時，對比樣品管外表麵縱向切口槽的深度等級應符合GB/T577-1996中C8的要求；對比樣品管外表麵上的縱向凹槽應符合GB/T 12606-1999中N12.5的規定，最小深度為0.5mm，最大深度為1.5mm。

5.2 Flattening test壓扁試驗

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.

外徑大於22mm至400mm、壁厚不超過10mm的鋼管應進行壓扁試驗。

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

壓扁試驗後，試樣上不得出現裂紋。

5.3 crimping test壓接試驗

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.根據買方的要求，供需雙方協商並在合同中明確表示，10號鋼製成的鋼管可以進行壓接試驗。

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（由內壁測量）不得小於標稱內徑的12%，也不得小於標稱壁厚的1.5倍，卷曲角度應為90°。壓接後，樣品卷曲外不得出現裂紋或裂紋。

5.4 Flaring test擴口試驗

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.

根據買方的要求，供需雙方協商並在合同中明確表示，壁厚不超過8mm的鋼管可以進行頂部錐度為30°、45°或60°的擴口試驗。擴口後試樣上不得出現裂紋。

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

擴口後樣品外徑的擴口比應符合表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

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的鋼管應進行彎曲試驗，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.

根據買方的要求，供需雙方協商並在合同中明確表示，機車鍋爐的鋼管可以彎曲。彎曲角度和芯半徑由供應商和買方協商確定。

6 Low-power test低功率試驗

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.

對於直接由連鑄坯或鋼錠製造的鋼管，供應商應確保鋼管或毛坯的橫截麵酸浸低強度試件上沒有白點、夾雜物、夾渣、表麵車削、分層和皮下氣泡。

7 Surface quality表麵質量

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.

鋼管的內外表麵不得有裂紋、褶皺、折痕、結痂或分離，這些缺陷應完全清除。間隙深度不得超過公稱壁厚的負偏差，清洗現場的實際壁厚不得小於壁厚允許的最小值。

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偏差且剩餘壁厚不小於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.

根據買方的要求，經供需雙方協商，並在合同中，鋼管可以逐一進行超聲波檢測。樣品管外表麵縱向凹槽的深度應符合GB/T 5777-1996中C8的要求。

Test methods試驗方法

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

1鋼管的尺寸應使用符合精度要求的量規逐一測量。

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

2鋼管內外表麵應逐一進行目視檢查。

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

3鋼管的其他檢驗項目應符合表6的要求。

Table 6 Inspection items, sampling quantities and test methods for steel pipes鋼管檢驗項目、取樣數量及試驗方法

 

Inspection rules檢驗規則

1 Inspection and acceptance檢查驗收

The inspection and acceptance of steel pipes shall comply with the provisions of GB/T 2102.鋼管的檢驗和驗收應符合GB/T 2102的規定。

2 Batch rule批處理規則

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).

鋼管分批驗收。每批應由相同等級、相同爐（罐）號、相同規格和相同熱處理係統（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視為一個。

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

每批鋼管的根數不超過以下值：

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

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

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

外徑大於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.

當剩餘鋼管數量不少於上述規定的50%時，應按批次列出；如果低於上述50%，則可以將其合並到相鄰批次中的相同等級、相同爐（罐）號、相同規格和相同熱處理係統（爐）Next）中。

3 Number of samples樣本數量

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

每批鋼管的每個檢驗項目的取樣數量應符合表6的規定。

4 Re-inspection and decision rules複檢和決策規則

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

鋼管複驗判定規則應符合GB/T 2102的規定。

Packaging, marking and quality instructions包裝、標記和質量說明

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

鋼管的包裝、標誌和質量規格應符合GB/T 2102的規定。

Test Requirement測試要求

Flattening Test壓扁試驗

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

外徑大於22mm至400mm、壁厚大於10mm的鋼管應進行壓扁試驗。樣品壓平後

Bending Test彎曲試驗

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.

外徑不大於22Mm的鋼管應進行彎曲試驗。彎曲角度為90度。彎曲半徑是鋼管外徑的6倍。彎曲樣品後，樣品上不允許出現裂縫或裂紋。

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.

對於直接由連鑄鋼坯或鋼錠製成的鋼管，供應方應保證鋼坯或鋼管的酸洗宏觀組織橫截麵上沒有白點、雜質、亞表麵氣泡、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.

根據需求方的要求，然後供需雙方協商並在協議中指出，鋼管可以單獨進行超聲波探傷。參考樣品管的縱向手動缺陷應符合GB/T 5777-1996規定的C8級檢驗後驗收要求。

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