Chemical Component GB/T5000.6-1998 Of Carbon Steel - News

Compilation of the chemical composition standards of steel casting parts

Table 1 Chemical composition (%) GB919- - -67

grade of steel	C	Mn	Si	S P(≤)
grade of steel	C	Mn	Si	Ⅰ	Ⅱ	Ⅲ
ZG15	0.12~0.22	0.35~0.65	0.20~0.45	0.04	0.05	0.06
ZG25	0.22~0.32	0.50~0.80	0.20~0.45	0.04	0.05	0.06
ZG35	0.32~0.42	0.50~0.80	0.20~0.45	0.04	0.05	0.06
ZG45	0.42~0.52	0.50~0.80	0.20~0.45	0.04	0.05	0.06
ZG55	0.52~0.62	0.50~0.80	0.20~0.45	0.04	0.05	0.06

Note: I —— advanced cast steel; —— high quality cast steel; —— ordinary cast steel; I, or is not indicated at the back of the steel number, are regarded as grade cast steel.

Table 2 Chemical component GB/T5000.6-1998 of carbon steel

grade of steel	The highest element content was (%)
	C	Si	Mn	S	P	residual elements
						Ni	Cr	Cu	Mo	V
ZG200~400	0.20	0.50	0.80	0.04	0.04	0.30	0.35	0.30	0.20	0.05
ZG230~450	0.30		0.90
ZG270~500	0.40
ZG310~570	0.50	0.60
ZG340~640	0.60

pour:①. Reduce the upper limit by 0.01% carbon, allowing 0.04% additional manganese. For ZG 200 ~ 400 manganese up to 1.00%, the remaining four grade manganese high to 1.20%.

②. The total amount of residual elements shall not exceed 1.00%. If the buyer does not require, the residual elements may not be analyzed.

③. When acid furnace are used to produce castings, the content of S and P shall be agreed by both parties.

Table 3 Chemical composition JB/T5000.6-1998 of low alloy steel

the name of a shop	C	Si	Mn	P	S	Cr	Ni	Mo	Cu
ZG30Mn	0.27~0.34	0.30~0.50	1.20~1.50	≤0.035		－	－	－	－
ZG40Mn	0.35~0.45	0.30~0.45	1.20~1.50	≤0.035		－	－	－	－
ZG40Mn2	0.35~0.45	0.20~0.40	1.60~1.80	≤0.035		－	－	－	－
ZG50Mn2	0.45~0.55	0.20~0.40	1.50~1.80	≤0.035		－	－	－	－
ZG20Mn(ZG20SiMn)	0.12~0.22	0.60~0.80	1.00~1.30	≤0.035		－	≤0.40	－	－
ZG35Mn(ZG35SiMn)	0.30~0.40	0.60~0.80	1.10~1.40	≤0.035		－	－	－	－
ZG35SiMnMo	0.32~0.40	1.10~1.40	1.10~1.40	≤0.035		－	－	0.20~0.30	≤0.30
ZG35CrMnSi	0.30~0.40	0.50~0.75	0.90~1.20	≤0.035		0.50~0.80	－	－	－
ZG20MnMo	0.17~0.23	0.20~0.40	1.10~1.40	≤0.035			－	0.20~0.35	≤0.30
ZG55CrMnMo(ZG5CrMnMo)	0.50~0.60	0.25~0.60	1.20~1.60	≤0.035		0.60~0.90	－	0.20~0.30	≤0.30
ZG40Crl(ZG40Cr)	0.35~0.45	0.20~0.40	0.50~0.80	≤0.035		0.80~1.10	－	－	－
ZG34Cr2Ni2Mo(ZG34CrNiMo)	0.30~0.37	0.30~0.60	0.60~1.00	≤0.035		1.40~1.70	1.40~1.70	0.15~0.35	－
ZG20CrMo	0.17~0.25	0.20~0.45	0.50~0.80	≤0.035		0.50~0.80	－	0.40~0.60	－
ZG35CrlMo(ZG35CrMo)	0.30~0.37	0.30~0.50	0.50~0.80	≤0.035		0.80~1.20	－	0.20~0.30	－
ZG42CrlMo(ZG42CrMo)	0.38~0.45	0.30~0.60	0.60~1.00	≤0.035		0.80~1.20	－	0.20~0.30	－
ZG50CrlMo(ZG50CrMo)	0.46~0.54	0.25~0.50	0.50~0.80	≤0.035		0.90~1.20	－	0.15~0.25	－
ZG65Mn	0.60~0.70	0.17~0.37	0.90~1.20	≤0.035		－	－	－	－
ZG28NiCrMo	0.25~0.30	0.30~0.80	0.60~0.80	≤0.035		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	≤0.035		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	≤0.035		0.40~0.90	0.60~0.90	0.40~0.50	－

Note: 1. The number in brackets is the traditional number.2. Residual elements content: Ni 0.30%, Cr 0.30%, Cu 0.25%, Mo 0.15%, V 0.05%, total residual elements 1%. If the demander has no requirements, the residual elements shall not be used as the basis for acceptance.

Table 4 JB / T7024- - -2002

the name of a shop	C	Mn	Si	P	S	Cr	Mo	V
ZG20CrMo	0.15~0.25	0.50~0.80	0.20~0.60	≤0.030	≤0.030	0.50~0.80	0.40~0.60	－
ZG15CrlMo	0.12~0.20	0.50~0.80	≤0.60		≤0.025	1.00~1.50	0.45~0.65	0.20~0.30
ZG15Cr2Mol	0.12~0.18	0.40~0.70	≤0.60		≤0.030	2.00~2.75	0.90~1.20	0.20~0.30
ZG20CrMoV	0.18~0.25		0.20~0.60			0.90~1.20	0.50~0.70	0.25~0.40
ZG15CrlMolV	0.12~0.20		0.20~0.60			1.20~1.70	0.90~1.20	0.25~0.40
allowable deviation	±0.02	±0.03	±0.04	±0.005	±0.005	±0.05	±0.03	±0.03