EN10025-6 S550QL1

This EN10025-6 document has been prepared by Technical Committee ECISS/TC 1 0 "Structural steels - Grades and qualities", the secretariat of which is held by NEN. Shanghai Katalor has great ex-works plates and can also make machining service such as cutting, welding, beveled, bending, drilling and other machining jobs.

EN10025-6 S550QL1 Chemical Composition   

Grade	Chemical Composition
S550QL1	The Element Max (%)
	C	Si	Mn	P	S	Nb	V	Ti	Zr	Cr	Ni	Mo	Cu	N
	0.22	0.86	1.80	0.030	0.017	0.07	0.14	0.07	0.17	1.60	2.1	0.74	0.55	0.016

                                                           

EN10025-6 S550QL1 Mechanical Property

Grade	Mechanical Property
S550QL1	Yield Strength mm Min(Mpa)			Tensile Strength mm Min(Mpa)			Elongation Min,%
	≥ 3 ≤ 50	＞ 50 ≤ 100	＞ 100 ≤ 150	≥ 3 ≤ 50	＞ 50 ≤ 100	＞ 100 ≤ 150
	550	530	490	640-820		590-770	16

For grade EN10025-6 S550QL1, S is the symbol for structural steel, 550 is the indication of the minimum specified yield strength for thickness < 50 mm expressed in MPa1, Q is for the quenched and tempered delivery condition, and L1 is for for the quality with specified minimum values of impact energy at temperatures not lower than -60℃.

The maximum carbon equivalent values based on the ladle analysis for EN10025-6 S550QL1, given in Table 4 shall apply. For the carbon equivalent value formula see 7.2.3 of EN 10025-1. When S550QL1 products are supplied with a control on Si e.g. for hot-dip zinc-coating so that there could be a need to increase the content of other elements like C and Mn to achieve the required tensile properties, the maximum carbon equivalent values of Table 4 shall be increased as follows:

- for Si < 0,030 %, increase CEV by 0,02 %;
- for Si < 0,25 %, increase CEV by 0,01 %.