For the micro-alloyed high strength steel alloy of oil and gas pipeline, repairing of the unqualified welds is one of the main working procedures. 摘要对于微合金高强度钢油气输送管线,不合格焊缝的返修是主要工序之一。
This standard presents the process for preventing hydrogen embrittlement in high-strength steel. 本标准介绍了高强度钢制紧固件的氢脆防治的方法。