EN 10025-6 high strength steel plates S550Q, S550QL, S550QL1

Description: EN 10025-6 high strength steel plates S550 includes steel grades of S550Q, S550QL and S550QL1. They are quenched and tempered high-strength steel plates. The im...

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EN 10025-6 high strength steel plates S550Q, S550QL, S550QL1 Description

EN 10025-6 high strength steel plates S550Q, S550QL, S550QL1. Check the complete grade, product form, applicable edition and ordered dimensions.

Identify the Q, QL or QL1 suffix, thickness, ordered impact temperature, certificate and permitted fabrication route.

EN 10025-6 high strength steel plates S550 includes steel grades of S550Q, S550QL and S550QL1. They are quenched and tempered high-strength steel plates. The impact temperature of S550Q steel is at -20℃, the impact temperature of S550QL steel is at -50℃, and the impact temperature of S550QL1 steel is at -60℃.

EN 10025-6 high strength steel plates S550Q, S550QL, S550QL1 chemical composition of heat analysis:

Legacy technical table · verification required

Confirm every value against the applicable edition, thickness and material certificate.

Legacy technical table
Grade	C	Si	Mn	P	S	N	B	Cr	Cu	Mo	Nb	Ni	Ti	V	Zr
S550Q	0.20	0.80	1.70	0.025	0.015	0.015	0.005	1.50	0.50	0.70	0.06	4.0	0.05	0.12	0.15
S550QL, S550QL1				0.020	0.010

EN 10025-6 high strength steel plates S550Q, S550QL, S550QL1 chemical composition of product analysis:

Legacy technical table · verification required

Confirm every value against the applicable edition, thickness and material certificate.

Legacy technical table
Grade	C	Si	Mn	P	S	N	B	Cr	Cu	Mo	Nb	Ni	Ti	V	Zr
S550Q	0.22	0.86	1.8	0.03	0.017	0.016	0.006	1.6	0.55	0.74	0.07	4.1	0.07	0.14	0.17
S550QL, S550QL1				0.025	0.012

EN 10025-6 high strength steel plates S550Q, S550QL, S550QL1 mechanical properties - tensile test properties at room temperature:

Legacy technical table · verification required

Confirm every value against the applicable edition, thickness and material certificate.

Legacy technical table
EN 10025-6	Steel number	Min. Yield Strength (MPa)				Tensile Strength (MPa)				Min. Elongation
		≥3 ≤50	>50 ≤100	>100 ≤125	>125 ≤200	≥3 ≤50	>50 ≤100	>100 ≤125	>125 ≤200
S550Q	1.8904	550	530	490		640 to 820		590 to 770		16
S550QL	1.8926
S550QL1	1.8986

EN 10025-6 high strength steel plates S550Q, S550QL, S550QL1 mechanical properties - impact energy on test pieces:

Legacy technical table · verification required

Confirm every value against the applicable edition, thickness and material certificate.

Legacy technical table
EN 10025-6	Min. impact energy (J) at test temperature (℃)
Grade	0		-20		-40		-60
Grade	Longitudinal	Transverse	Longitudinal	Transverse	Longitudinal	Transverse	Longitudinal	Transverse
S550Q	40	30	30	27	-	-	-	-
S550QL	50	35	40	30	30	27	-	-
S550QL1	60	40	50	35	40	30	30	27

EN 10025-6 high strength steel plates S550Q, S550QL, S550QL1 are usually supplied in quenching and tempering condition. The requirements of flaw detection, Z-direction performance and special alloy elements can also be added, but it should be indicated in the contract.

EN 10025-6 high strength steel plates S550Q, S550QL, S550QL1 are used for manufacturing low temperature and high strength key components, construction machinery, mining machinery structure, etc. They are commonly used in the construction of hydropower stations and in the manufacture of hydraulic turbines.

Source and scope

DIN EN 10025-6:2023-06, EN 10025-6:2019+A1:2022 · Quenched and tempered high-yield flat products, scope. Part 6 concerns flat products of high-yield structural steels in the quenched-and-tempered condition. Specify the Q, QL or QL1 grade, ordered thickness and required impact tests.

Apply the cited scope to the matching designation and form. Confirm any remaining technical values with the applicable edition or material certificate.

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