高强度耐候钢SPA-H的试制

Trial Production of High Strength Weather-Resisting Steel SPA-H

南钢采用100t电弧炉-钢包炉-连铸-轧制工艺路线试制了成分（％）为：C≤0．12，Mn0．20～0．50。Si0.25～0.75，P0．07～0．15，s≤0．04，Cu0．25～0．60，Cr0．30～1．25，Ni≤0．65低合金高强度耐候钢SPA-H钢带。检验和使用结果表明，该钢组织为铁素体＋珠光体，有较高洁净度，钢的屈服强度345～435MPa，抗拉强度480～570MPa，延伸率23％～43％，并具有良好的焊接性能。

The low alloying high strength weather-resisting steel SPA-H strip - C≤0.12, Mn 0.20 - 0.50, Si 0.25 - 0.75, P 0.07 - 0.15, S≤0.04, Cu 0.25 - 0.60, Cr 0.30- 1.25, Ni≤0.65 has been trial-produced by flow sheet of an 100 t electric arc furnace - ladle furnace - concaster - rolling mill at Nanjing Steel. The results of examination and service showed that the steel structure was ferrite ＋ pearlite and has higher cleanliness, the yield strength of steel was 345 - 435 MPa, tensile strength 480- 570 MPa, elongation 23% -43%, and the steel has excellent weld ability.