Q255B Q255 - GB 700-1988

Q255B Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr ^①	Ni ^①	Cu ^①	As ^①④	N ^①
Minimum Value	0.18	-	0.4	-	-	-	-	-	-	-
Maximum Value	0.28	0.3	0.7	0.045	0.045	0.3	0.3	0.3	0.008	0.008

Q255B Mechanical Properties

thickness t mm	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %
t≤16	415~550	≥255	≥24
16<t≤40	415~550	≥245	≥23
40<t≤60	415~550	≥235	≥22
60<t≤100	415~550	≥225	≥21
100<t≤150	415~550	≥215	≥20
t>150	415~550	≥205	≥19

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!