API5LB和A106GRB、A53GRB是不是同一类或同一种钢呢

API 5L: 管线钢管

X60: 钢管级别，屈服415~565MPa，抗拉520~760MPa

PLS2:生产规格级别2（product specification level 2)

QS: 前面的Q表示发货状态（Quenched淬火），后面的S表示服务环境（有硫S）

美标ASME SA-213M TP316H无缝钢管ASME SA-106 SA-106B无缝钢管特价销售14、GB13296-2006（锅炉、热交换器用不锈钢无缝钢管）。主要用于化工企业的锅炉、过热器、热交换器、冷凝器、催化管等。用的耐高温、高压、耐腐蚀的钢管。其代表材质为0Cr18Ni9、1Cr18Ni9Ti、0Cr18Ni12Mo2Ti等。 美标ASME SA-213M TP316H无缝钢管美标ASME SA-213M TP316H无缝钢管欧标St 44-3无缝钢管美标API 5L PLS1 L450无缝钢管6、GB/T6479-2000（高压化肥设备用无缝钢管）。主要用于化肥设备上输送高温高压流体管道。代表材质为20、16Mn、12CrMo、12Cr2Mo等。

1、从加工角度讲：直缝钢管是将一定宽度的钢板弯制成筒，然后焊接成型，设备比较简单，生产率也较高。螺旋钢管是将一定宽度的钢板绕制成筒，然后焊接成型，设备比较复杂，同时由于焊缝要比直缝钢管长得多，所以生产率相对低一些。

2、从强度角度讲：直缝钢管在焊接后，其内应力沿焊缝分布，而螺旋钢管焊后的内应力沿轴向和径向均匀分布，可以更好地部分抵消所承受的压力。所以在耐压能力上，螺旋钢管更强一些。

翻译成英语吗？

Test case:

1: on May 22 to 7:50, the sea embellish warehouse check the quantity of steel tube, quantity meet packing list requirements.

2: for visual examination of appearance, I found no protection caps loss and damage. Tube body also found no scratches and potholes defects. Steel tube surface paint also is evener.

3: this batch of pipe threaded requirements sandblasting processing. So the ChangBao staff called the batch of steel pipe inner surface inspection, found a partial inside steel without clean up the yellow. ChangBao staff told TPI5 16th and 18th inside steel production part of clean surface stretches without. Reasons for the production line workers on duty to improper (sandblasting versatile block and steel seal is not good enough). To deal with the yellow inside pipe must be unpacking the field of personnel and their leadership ChangBao consultation, and decided on May 16 and 18 all steel tube shipments to "Shanghai numerous are long steel pipe Co., LTD" perform re-examination and clean sand. A total of 117 bundle of steel tube need to clean sand and inspection

4: TPI to all ChangBao personnel on site and cleaned steel pick May 16 and May 18 this two days production tube

5: TPI requirements on May 15, 17, 19 production in random undiscovered steel pipe with sand. Sampling ratio is 10%

6:15:00 site leave a inspectors packing inspection (2-7/8 of steel tube packing) the rest of the crew to Shanghai numerous are RON petropipe Co., LTD. Deal with 5-1/2 have the sand tube.

7: in Shanghai numerous are long steel tube Co., ltd., hoisting because the days within 2 bundle of steel lathe work immodesty drop on the ground, pipe-aend serious deformation, (bundle number: pls03023471, pls03023474) pipe-aend deformation of steel tube as below:

pls是英文单词“please”的缩写，意思是“请”。

please 含义

v. (动词) 使高兴，使快乐，使愉快，取悦，使喜欢， 使满意，使满足，使欢喜，讨...欢心，使中意。

int. (感叹词) 请，请千万，请务必。

please 音标

英 [pliːz]  ，美 [pliːz]

please例句

1、Please come with me.

请跟我来。

2、Please call if you require assistance.

如果需要帮忙，请打电话。

please用法：

1、please的基本意思是“请”，指要求某人做某事时的一种礼貌的请求，也可用来加强请求或愿望的语气，表示“对不起，请”。

2、please多用在祈使句中，可放在句首,也可放在句末，放在句末时，please前多有逗号。

3、please用作动词时的意思是“使高兴，使满意”，指欲望或兴趣得到满足后产生强烈的兴奋、满意的情绪。还可指“想要，喜欢”，指对某物的渴望。

化学成分：

碳:<=0.3%

锰:0.29%~1.06%

磷:<=0.035%

硫:<=0.035%

硅:>=0.1%

铬:<=0.40%

铜:<=0.40%

钼:<=0.15%

镍:<=0.40%

钒:<=0.08%

a106b 属于美标标准无缝钢管，与中国20#标准一样。

a106b按生产方法不同可分为热轧管、冷轧管、冷拔管、挤压管等。