High-strength quenched and tempered 30CrMnSiA steel plate

Technical standard of 30CrMnSiA steel plate: GB/T 11251.

30CrMnSiA high-strength quenched and tempered structural steel has high strength and toughness, high hardenability, medium cold deformation plasticity, good cutting performance, tendency to temper brittleness, and poor transverse impact toughness.

Melting analysis of chemical composition of 30CrMnSiA steel plate:

Grade	C	Si	Mn	S	P	Cr	Ni	Cu
30CrMnSiA	0.28-0.34	0.90-1.20	0.80-1.10	≤0.025	≤0.025	0.80-1.10	≤0.030	≤0.025

Mechanical properties of 30CrMnSiA steel plate:

Grade	Tensile strength MPa	Lower yield strength MPa	Elongation after fracture %	Hardness value
30CrMnSiA	≥1080	835	≥10	≤229HB

Ultrasonic flaw detection of 30CrMnSiA steel plate:
30CrMnSiA steel ultrasonic inspection standard GB/T 2970. This standard specifies the ultrasonic inspection comparative samples, inspection instruments and equipment, inspection conditions and methods, defect determination and evaluation, steel quality classification, inspection reports, etc. of thick 30CrMnSiA steel plates.