1）低碳：由于韧性、焊接性和冷成形性能的要求高，其碳含量不超过0.20%；（2）加入以锰为主的合金元素；（3）加入铌、钛或钒等辅加元素：少量的铌、钛或钒在钢中形成细碳化物或碳氮化物，有利于获得细小的铁素体晶粒和提高钢的强度和韧性；此外，加入少量铜（≤0.4%）和磷（0.1%左右）等，可提高抗腐蚀性能。
1) low carbon: the toughness, weldability and cold forming performance requirements, the carbon content is less than 0.20%; (2) adding alloy elements to manganese based; (3) adding niobium, titanium or vanadium and other auxiliary elements: a small amount of niobium, titanium or vanadium carbide or carbonitride in fine form in steel, to obtain the fine ferrite grain and improve the strength and toughness of steel; in addition, adding a small amount of copper (less than 0.4%) and phosphorus (about 0.1%), can improve the corrosion resistance.
加入少量稀土元素，可以脱硫、去气，使钢材净化，改善韧性和工艺性能。关于低合金板经过前一段时间的快速反弹.

Add a small amount of rare earth elements, can desulfurization, degassing, so that steel purification, improve toughness and process performance. On the low alloy plate after a period of rapid rebound.
上周国内钢材市场价格涨幅明显放缓，继续上涨动力减弱;在成交不畅的情况下，市场疲态渐现，加上期钢市场的持弱偏弱震荡，进一步加重商家观望心态，因此上周钢价窄幅震荡回落，供需双方均有一定的观望心态，因需求基本面受到南方雨水影响及商家在月底资金压力再现影响，预计短期内国内钢价。
Last week, the domestic steel market price increase is slowing down, continue to rise in power weakened; poor turnover situation, the market weakness gradually, plus the steel market to weak weak shocks, further aggravating the business mentality, so last week, steel price shocks narrow down, the two sides of supply and demand have a certain wait-and-see attitude, by the rain in the South and businesses in the end of the month due to financial pressure reproduction demand fundamentals, expected short-term domestic steel prices.
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