The cabin area utilizes a 4130 chrome-moly (chromium-molybdenum) welded steel tube frame top assembly.
该舱区采用了4130铬钼（铬钼）焊接钢管架顶部大会。
2
For those local surface defects on chromesteel and chrome-molybdenumsteel, welding rod A402 may be used for repairing, no other treatment is necessary.
铬钢和铬钼钢表面局部缺陷焊补可采用A402焊条补焊，不需处理。
3
In this paper regression analyses for the relations between strength and hardness of chrome - Nickel - Molybdenumsteel are carried out, the relevant formulas of the regression relations are set up.