Low Alloy Cast Steel

Low alloy cast steel refers to alloy cast steel with a carbon content of less than 0.45% and a total content of other alloying elements not exceeding 5%. Low alloy cast steel has high strength, good toughness and hardenability. Low alloy cast steel generally contains alloying elements such as manganese, chromium, copper, nickel, molybdenum, and vanadium. They have greater impact toughness and can obtain better mechanical properties through heat treatment. The corrosion resistance and wear resistance of low alloy cast steel are better than carbon steel, which can reduce the weight of parts and increase service life.

 

Grades and Chemical Compositions of Low Alloy Cast Steel
Grade	C (%)	Si (%)	Mn (%)	P≦ (%)	S≦ (%)	Cr (%)	Ni (%)	Mo (%)	Cu≦ (%)
ZG20Mn	0.16~0.22	0.6~0.8	1.00~1.30	0.03	0.03	——	≦0.4	——	——
ZG30Mn	0.27~0.34	0.30~0.50	1.20~1.50	0.03	0.03	——	——	——	——
ZG35Mn	0.30~0.40	0.60~0.80	1.10~1.40	0.03	0.03	——	——	——	——
ZG40Mn	0.35~0.45	0.30~0.45	1.20~1.50	0.03	0.03	——	——	——	——
ZG40Mn2	0.35~0.45	0.20~0.40	1.60~1.80	0.03	0.03	——	——	——	——
ZG45Mn2	0.42~0.49	0.20~0.40	1.60~1.80	0.03	0.03	——	——	——	——
ZG50Mn2	0.45~0.55	0.20~0.40	1.50~1.80	0.03	0.03	——	——	——	——
ZG35SiMnMo	0.32~0.40	1.10~1.40	1.10~1.40	0.03	0.03	——		0.20~0.30	0.3
ZG35CrMnSi	0.30~0.40	0.50~0.75	0.90~1.20	0.03	0.03	0.50~0.80	——	——	——
ZG20MnMo	0.17~0.23	0.20~0.40	1.10~1.40	0.03	0.03	——	——	0.20~0.35	0.3
ZG30Cr1MnMo	0.25~0.35	0.17~0.45	0.90~1.20	0.03	0.03	0.90~1.20		0.20~0.30	——
ZG55CrMnMo	0.50~0.60	0.25~0.60	1.20~1.80	0.03	0.03	0.60~0.90	——	0.20~0.30	0.3
ZG40Cr1	0.35~0.45	0.20~0.40	0.50~0.80	0.03	0.03	0.80~1.10	——	——	——
ZG34Cr2Ni2Mo	0.30~0.37	0.30~0.60	0.60~1.00	0.03	0.03	1.40~1.70	1.40~1.70	0.15~0.35	——
ZG15Cr1Mo	0.12~0.20	0.6	0.50~0.80	0.03	0.03	1.00~1.50	——	0.45~0.65	——
ZG20CrMo	0.17~0.25	0.20~0.45	0.50~0.80	0.03	0.03	0.50~0.80	——	0.45~0.65	——
ZG35Cr1Mo	0.30~0.37	0.30~0.50	0.50~0.80	0.03	0.03	0.80~1.20	——	0.20~0.30	——
ZG42Cr1Mo	0.38~0.45	0.30~0.60	0.60~1.00	0.03	0.03	0.80~1.20	——	0.20~0.30	——
ZG50Cr1Mo	0.46~0.54	0.25~0.50	0.50~0.80	0.03	0.03	0.90~1.20	——	0.15~0.25	——
ZG65Mn	0.60~0.70	0.17~0.37	0.90~1.20	0.03	0.03	——	——	——	——
ZG28NiCrMo	0.25~0.30	0.30~0.80	0.60~0.90	0.03	0.03	0.35~0.85	0.40~0.80	0.35~0.55	——
ZG30NiCrMo	0.25~0.35	0.30~0.60	0.70~1.00	0.03	0.03	0.60~0.90	0.60~1.00	0.35~0.50	——
ZG35NiCrMo	0.30~0.37	0.60~0.90	0.70~1.00	0.03	0.03	0.40~0.90	0.60~0.90	0.40~0.50	——

 

Mechanical properties of low alloy cast steel
Grade	Heat Treatment	Yield Strength Rp0.2/Mpa (≧)	Tensile Strength Rm/Mpa (≧)	A(%) ≧	Z(%) ≧	KU2/J ≧	KV2/J ≧	AKDVM/J ≧	Hardness HBW
ZG20Mn	Normalization + Tempering	285	495	18	30	39	——	——	145
	Quenching + Tempering	300	500~650	24	——	——	45	——	150~190
ZG30Mn	Normalization + Tempering	300	558	18	30	——	——	——	163
ZG35Mn	Normalization + Tempering	345	570	12	20	24	——	——	——
	Quenching + Tempering	415	640	12	25	27	——	27	200~240
ZG40Mn	Normalization + Tempering	295	640	12	30	——	——	——	163
ZG40Mn2	Normalization + Tempering	395	590	20	40	30	——	——	179
	Quenching + Tempering	685	835	13	45	35	——	35	269~302
ZG45Mn2	Normalization + Tempering	392	637	15	30	——	——	——	179
ZG50Mn2	Normalization + Tempering	445	785	18	37	——	——	——	——
ZG35SiMnMo	Normalization + Tempering	395	640	12	20	24	——	——	——
	Quenching + Tempering	490	490	12	25	27	——	27	——
ZG35Mn	Normalization + Tempering	345	570	12	20	24	——	——	——
	Quenching + Tempering	415	640	12	25	27	——	27	——
ZG35CrMnSi	Normalization + Tempering	345	690	14	30	——	——	——	217
ZG20MnMo	Normalization + Tempering	295	490	16	——	39	——	——	156
ZG30Cr1MnMo	Normalization + Tempering	392	686	15	30	——	——	——	——
ZG55CrMnMo	Normalization + Tempering	/	/	——	——	——	——	——	——
ZG40Cr1	Normalization + Tempering	345	630	18	26	——	——	——	212
ZG34Cr2Ni2Mo	Quenching + Tempering	700	950~1000	12	——	——	32	——	240~290
ZG15Cr1Mo	Normalization + Tempering	275	490	20	35	24	——	——	140~220
ZG20CrMo	Normalization + Tempering	245	460	18	30	30	——	——	135~180
	Quenching + Tempering	245	460	18	30	24	——	——	——
ZG35Cr1Mo	Normalization + Tempering	392	588	12	20	23.5	——	——	——
	Quenching + Tempering	510	686	12	25	31	——	27	201
ZG42Cr1Mo	Normalization + Tempering	343	569	12	20	——	30	——	——
	Quenching + Tempering	490	690~830	11	——	——	——	21	200~250
ZG50Cr1Mo	Quenching + Tempering	520	740~880	11	——	——	——	34	200~260
ZG65Mn	Normalization + Tempering	/	/	——	——	——	——	——	——
ZG28NiCrMo	——	420	630	20	40	——	——	——	——
ZG30NiCrMo	——	590	730	17	35	——	——	——	——
ZG35NiCrMo	——	660	830	14	30	——	——	——	——