舞钢管线钢板X80定扎厚度不大于40mm，起订量要求大于75吨

1、我国管线钢的应用和起步较晚，过去已铺设的油、气管线大部分采用Q235和16Mn钢。“六五”期间，我国开始按照API标准研制X60、X65管线钢，并成功地与进口钢管一起用于管线敷设。90年代初宝钢、武钢又相继开发了高强高韧性的X70管线钢，并在涩宁兰管道工程上得到成功应用。

2、X80解析：

2.1、X在API Spec 5L标准中代表管线钢，80是强度级别，其单位是kpsi，X80表示最小屈服强度为的管线钢，转换成公制单位约等于。

2.2、在我国，L表示管线钢。在《GB/T 石油天然气工业 管线输送系统用钢管》中明确：我国的L555相当于API Spec 5L的X80。

2.3X80是高强度管线钢的美国分类型号。其最小屈服值（MPa）为555；这一概念属于材料力学范畴的概念，屈服值是指材料拉伸时在屈服阶段的应力值，屈服应力是指屈服阶段到劲缩阶段的临界值。

3、钢级从X60 迅速提高到了X80。2005 年中国首条X80 钢级管道应用工程在冀宁线上建成。

3.1、2005年，我国首条X80钢级管道应用工程在冀宁线上建成。武钢、宝钢、鞍钢为工程提供X80管线板卷和钢板，宝鸡、华北及巨龙钢管公司为工程完成制管。

3.2、2005年，我国已现场顺利焊接施工X80管线钢和管线钢管8公里，此举表明，我国X80管线钢和管线钢管生产应用技术已走向成熟。

3.3、1995年，X60管线钢首次应用于陕京管线。

3.4、2000年，X70即在涩-宁-兰管线上建成试验段。我国管线钢的钢级在短短五年内已迅速从X60提高到X70。近年来，在世界范围内管线工程均以X70管线钢为主，X80也已批量用于管线建设中，而且X100和更高钢级的管线钢也在开发和试用推广。

4、执行标准：API 5L标准、GB国标标准、各工程专用标准。

5、交货状态：主要以热轧及正火状态供货。

6、X80管线用钢特性：

X80管线钢具有高强度、高韧性、良好的焊接性、一定的抗HIC、SSC性能，并且提高管线钢级可节约建设成本。

7、早期的管线钢一直采用C、Mn、Si型的普通碳素钢，在冶金上侧重于性能，对化学成分没有严格的规定。自60年代开始，随着输油、气管道输送压力和管径的增大，开始采用低合金高强钢(HSLA)，主要以热轧及正火状态供货。

8、化学成分：

化学成分（质量分数） (%)          

C Si Mn P S Cr Ni Ti Nb V Mo

0.063 0.28 1.83 0.011 0.0006 0.03 0.03 0.016 0.061 0.059 0.22

9、力学性能：

指标 标准 实际值

抗拉强度/Mpa

屈服强度/Mpa

夏比冲击功（-20℃）/J ≥120

10拉伸性能：

试样 Rm/MPa Rt0.5/MPa A% Rt0.5/Rm

管体纵向 739 640 40.0 0.87

管体横向 764 622 39.5 0.81

焊接接头 729 断 于 母 材  

11、用途：

主要应用于石油天然气管道。

1. The and start of steel in China is late. Most of the oil and gas laid in the past were made of Q235 and 16Mn steel. the "sixth plan" China began to X60 and X65 steel to API and used them with steel pipes for .In the early and WisCO X70 steel with high and high which was in .

2. X80 :

2.1 X in API Spec 5L 80 is the the unit is KPSI, and X80 the steel with the yield of which is equal to when into units.

2.2 In L for steel.It is in GB/T Steel Pipes for of and gas that China's L555 is to X80 of API Spec 5L.

2.3X80 is the US for high steel.Its yield value (MPa) is 555.This to the of . The yield value to the value at the yield stage when the is and the yield to the value from the yield stage to the stage.

3. The steel grade was from X60 to X80.In 2005, China's first X80 steel grade was on the line.

3.1. In 2005, China's first X80 steel grade was on the Line. and Iron and Steel the X80 pipe coils and steel for the while and steel Tube made the pipes for the of the .

3.2. In 2005, X80 steel and steel tube were on site for 8 km, which that the and of X80 steel and steel tube in China has .

3.3. In 1995, X60 steel was first used in .

3.4. In 2000, X70 was in the test of The .The steel grade of steel in China has from X60 to X70 in just five years.In X70 steel is the main steel in the X80 has also been used in the in and X100 and steel grade steel is also being and tried out.

4. : API 5L GB and for each .

5. : hot and .

6. X80 steel :

X80 steel has high high good HIC SSC and can save cost by steel grade.

7. In the early stage of steel of C, Mn and Si types was used, which was more in than and there was no on .Since the with the of and pipe of oil and gas low alloy and high steel (HSLA) has been which is under hot and .

8. :

(Mass ) (%)

C Si Mn P S Cr Ni Ti Nb V Mo

0.063 0.28 1.83 0.011 0.0006 0.03 0.03 0.016 0.061 0.059 0.22

9. :

value

/Mpa

Yield /Mpa

work (-20℃) /J ≥120

10 :

Rm/MPa Rt0.5/MPa A% Rt0.5/Rm

Tube body 739 640 40.0 0.87

Tube body 764 622 39.5 0.81

Weld joint 729 to base metal

11. :

used in oil and gas .