P690QH 1.8880 - EN 10216-3-2013

Grade	P690QH
European Standard Steel Grade	1.8880
Corresponding Standard	EN 10216-3-2013 Seamless Steel Tubes for Pressure Purposes - Technical Delivery Conditions - Part 3: Alloy Fine Grain Steel Tubes
Classification	Alloy Steel

P690QH Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	N	Ti	V	Nb	Al ^ⓑ	More
Minimum Value	-	-	1.2	-	-	-	-	-	-	-	-	-	-	0.02	Al/N≥2ⓑ
Maximum Value	0.2	0.8	1.7	0.025	0.015	1.5	2.5	0.3	0.7	0.015	0.05	0.12	0.06	-	Al/N≥2ⓑ

P690QH Mechanical Properties

thickness t mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %
t≤20	Quenched and tempered (+QT)	770~960	≥690	≥16（l） ≥14（T）
20＜t≤40	Quenched and tempered (+QT)	720~900	≥650	≥16（l） ≥14（T）
40＜t≤50	Quenched and tempered (+QT)	670~850	≥615	≥16（l） ≥14（T）
50＜t≤65	Quenched and tempered (+QT)	670~850	≥580	≥16（l） ≥14（T）
65＜t≤80	Quenched and tempered (+QT)	620~800	≥540	≥16（l） ≥14（T）
80＜t≤100	Quenched and tempered (+QT)	620~800	≥500	≥16（l） ≥14（T）

Approximate Comparison Table Pressure-Bearing Flat Steel

International Organization for Standardization	European Standard
ISO	EN	Numerical Grade
P690QH	P690QH	1.8880

P690QH Corresponding Standards(Same grade name, different standards)

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