Q355D - GB /T 1591-2018

Grade	Q355D
Corresponding Standard	GB /T 1591-2018 High strength low alloy structural steels
Classification	Alloy Steel
Properties	Strength

Q355D Chemical Element Composition Content (%)

	Component	C ^①	Si	Mn	P ^②	S ^②	Cr	Ni	Cu	N ^③
厚度t≤30	Minimum Value	-	-	-	-	-	-	-	-	-
厚度t≤30	Maximum Value	0.2	0.55	1.6	0.025	0.025	0.3	0.3	0.4	0.012

	Component	C ^①	Si	Mn	P ^②	S ^②	Cr	Ni	Cu	N ^③
厚度30<t≤100	Minimum Value	-	-	-	-	-	-	-	-	-
厚度30<t≤100	Maximum Value	0.22	0.55	1.6	0.025	0.025	0.3	0.3	0.4	0.012

Q355D Mechanical Properties

condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
Long and Flat Products; t≤16; Longitudinal	470~630	≥355	≥22
Long and Flat Products; t≤16; Transverse	470~630	≥355	≥20
long material and flat material; 16 < t ≤ 40; longitudinal	470~630	≥345	≥22
Long and flat products; 16<t≤40; Transverse	470~630	≥345	≥20
long material and flat material; 40 < t ≤ 63; longitudinal	470~630	≥335	≥21
Long and flat products; 40<t≤63; Transverse	470~630	≥335	≥19
long material and flat material; 63 < t ≤ 80; longitudinal	470~630	≥325	≥20
Long and flat products; 63<t≤80; Transverse	470~630	≥325	≥18
long material and flat material; 80 < t ≤ 100; longitudinal	470~630	≥315	≥20
Long and flat products; 80<t≤100; Transverse	470~630	≥315	≥18
long material and flat material; 100 < t ≤ 150; longitudinal	450~600	≥295	≥18
Long and flat products; 100<t≤150; Transverse	450~600	≥295	≥18
long material and flat material; 150 < t ≤ 200; longitudinal	450~600	≥285	≥17
Long and flat products; 150<t≤200; Transverse	450~600	≥285	≥17
long material and flat material; 200 < t ≤ 250; longitudinal	450~600	≥275	≥17
Long and flat products; 200<t≤250; Transverse	450~600	≥275	≥17
Long Products and Flat Products; 250<t≤400; Longitudinal	450~600	≥265	≥17
Long Products and Flat Products; 250<t≤400; Transverse	450~600	≥265	≥17
Long products and flat products; longitudinal				≥34
Long products and flat products; transverse				≥27

Q355D Corresponding Standards(Same grade name, different standards)

1	GB /T 1591-2018
	Q355D
2	GB /T 34199-2017
	Q355D

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