Preheating shall be carried out for carbon and low alloy steel welding where required. Preheating temperature shall be kept uniform from the start to the end of welding.

在进行碳钢及低合金钢的焊接时应进行预热。预热温度在焊接开始到结束期间应保持均衡。

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The effects of opening flask temperature and cooling rate on low and high temperature age-hardening alloy casting are tested and studied.

试验研究了开箱温度和冷却速度对低、高温时效型合金时效硬化效果的影响。

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The low temperature toughness of low temperature steel can be improved effectively by means of adjusting alloy ingredients and modifying heat-treatment regime.

通过调整合金成份和改变热处理制度试验，有效地提高了低温钢的低温韧性。

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