For example , hot - forming of the quenchable boron - alloy steel 22mnb5 can produce complex , crash - resistant parts such as bumpers and pillars with ultrahigh strength , minimum springback , and reduced sheet thickness ( see figure 2 ) 用硼钢热冲压和模具冷却的工艺出现在90年代后期，起初是用于制造一些相对简单的汽车部件，如门梁和保险杠。
2.
The flame - retardant and mechanical properties of the frp specimens with different fra ratio were investigated . it is shown that the oxygen index of the resin with the ratio of 15wt % of the fra reachs 28 . the specimens are quenchable without any outer forces , however , the bending strength of the specimens decreases significantly 研究了不同阻燃剂含量frp的阻燃性能和力学性能,结果表明,阻燃剂加入量为15wt %时, frp氧指数达到了28以上,使该材料达到自熄级水平,但其弯曲强度下降较大。
