A709 Grade 50W - ASTM A709/A709M-2017

牌号	A709 Grade 50W
對應标準	ASTM A709/A709M-2017 橋梁用結構鋼 Structural Steel for Bridges
歸類	合金鋼

A709 Grade 50W 化學元素成分含量(%)

	成分	C ^①	Si	Mn ^①	P ^②	S ^②	Cr	Ni	Cu	V
Type A	最小值	-	0.3	0.8	-	-	0.4	-	0.25	0.02
Type A	最大值	0.19	0.65	1.25	0.03	0.03	0.65	0.4	0.4	0.1

	成分	C ^①	Si	Mn ^①	P	S	Cr	Ni	Cu	V
Type B	最小值	-	0.15	0.75	-	-	0.4	-	0.2	0.01
Type B	最大值	0.2	0.5	1.35	0.03	0.03	0.7	0.5	0.4	0.1

① For each reduction of 0.01 percentage point below the specified maximum for carbon, an Increase of 0.06 percentage point above the specified maximum for manganese is permitted, up to a maximum of 1.50 %.
② A maximum phosphorus content or 0.04 % and a maximum sulfur content of 0.05 % are permitted for the following materials：structural shapes, Bars, Plates with widths up to and including 15 in. (380mm).

碳當量計算

A709 Grade 50W 機械性能

條件	抗拉強度 σ_b Mpa	屈服點 σ_s Mpa	斷後伸長率或延伸率 δ %
棒材,闆材; t≤100mm	≥485	≥345	（in 50mm） ≥21
型鋼	≥485	≥345	≥21

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