迄今为止，高碳合金钢材料的焊接理论仍未完善。
Up to now, the welding theory for high carbon alloy steel has not been well established.
采用航天铝钛合金及超高强度合金钢材料，强度高，重量轻。
Made of spaceflight Al-Ti alloy and super high strengthened alloy steel material, high strength, light weight.
合金钢材料，全部焊接密封，防油、防水、耐腐蚀，可适用于各种环境。
Alloy steel, hermetically welded, oil-proof, waterproof and anti-corrosion, suitable for all kinds of environments.
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