Low Alloy Cast Steel na Ginagamit para sa Casting Parts

Ang mababang haluang metal na bakal ay tumutukoy sa haluang metal na bakal na may nilalamang carbon na mas mababa sa 0.45% at isang kabuuang nilalaman ng iba pang mga elemento ng alloying na hindi hihigit sa 5%. Ang mababang haluang metal na cast steel ay may mataas na lakas, magandang tibay at hardenability. Ang mababang alloy na cast steel ay karaniwang naglalaman ng mga elemento ng alloying tulad ng manganese, chromium, copper, nickel, molibdenum, at vanadium. Ang mga ito ay may mas malaking epekto ng tigas at maaaring makakuha ng mas mahusay na mga mekanikal na katangian sa pamamagitan ng paggamot sa init. Ang corrosion resistance at wear resistance ng low alloy cast steel ay mas mahusay kaysa sa carbon steel, na maaaring mabawasan ang bigat ng mga bahagi at mapataas ang buhay ng serbisyo.

 

Mga Grado at Chemical Composition ng 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	——

 

Mga mekanikal na katangian ng mababang haluang metal cast steel
Grade	Paggamot sa init	Lakas ng Yield Rp0.2/Mpa (≧)	Lakas ng Tensile Rm/Mpa (≧)	A(%) ≧	Z(%) ≧	KU2/J ≧	KV2/J ≧	AKDVM/J ≧	Katigasan HBW
ZG20Mn	Normalization + Tempering	285	495	18	30	39	——	——	145
	Pagsusubo + Pag-tempera	300	500~650	24	——	——	45	——	150~190
ZG30Mn	Normalization + Tempering	300	558	18	30	——	——	——	163
ZG35Mn	Normalization + Tempering	345	570	12	20	24	——	——	——
	Pagsusubo + Pag-tempera	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
	Pagsusubo + Pag-tempera	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	——	——	——
	Pagsusubo + Pag-tempera	490	490	12	25	27	——	27	——
ZG35Mn	Normalization + Tempering	345	570	12	20	24	——	——	——
	Pagsusubo + Pag-tempera	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	Pagsusubo + Pag-tempera	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
	Pagsusubo + Pag-tempera	245	460	18	30	24	——	——	——
ZG35Cr1Mo	Normalization + Tempering	392	588	12	20	23.5	——	——	——
	Pagsusubo + Pag-tempera	510	686	12	25	31	——	27	201
ZG42Cr1Mo	Normalization + Tempering	343	569	12	20	——	30	——	——
	Pagsusubo + Pag-tempera	490	690~830	11	——	——	——	21	200~250
ZG50Cr1Mo	Pagsusubo + Pag-tempera	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	——	——	——	——