无锡精密方管25X25x1.5现货价格/无锡精密小口径薄壁方管库存

精密方管知识：-精密无缝钢管各种材质化学成份对照表

牌号	化学成分%
	C	Si	Mn	S	P	Cr
10	0.07-0.13	0.17-0.37	0.35-0.65	≤0.035	≤0.035
20	0.17-0.23	0.17-0.37	0.35-0.65	≤0.035	≤0.035
35	0.32-0.39	0.17-0.37	0.35-0.65	≤0.035	≤0.035
45	0.42-0.50	0.17-0.37	0.50-0.80	≤0.035	≤0.035
40cr	0.37-0.44	0.17-0.37	0.50-0.80	≤0.035	≤0.035	0.08-1.10
25Mn	0.22-0.2	0.17-0.37	0.70-1.00	≤0.035	≤0.035	≤0.25
37Mn5	0.30-0.39	0.15-0.30	1.20-1.50	≤0.015	≤0.020