Standard No.:	JBZQ 4297-1986
English Name:	Alloy cast steel
Chinese Name:	合金铸件
Professional Classification:	JB    Professional Standard - Machinery
Issued by:	Heavy Machine Bureau of National Mechanical Industry Committee
Issued on:	1986-12-20
Implemented on:	1986-12-20
Status:	valid
Language:	English
File Format:	PDF
Word Count:	1000 words
Price(USD):	20.0
Delivery:	via email in 1 business day

Alloy Cast Steel 合金铸钢 This standard is applicable to the casting casted in sand mould or the casting mould with similar thermal conductivity with the sand mould. 1 Manufacture The steelmaking method, castings production process and heat treatment process are determined by the manufacturer. 2 Chemical Composition The chemical composition of alloy cast steel shall be in accordance with those specified in Table 1. Table 1 Chemical Composition of Alloy Cast Steel Steel grade Chemical compositions % C Si Mn S P Cr Ni Mo Cu ZG40Mn 0.35~0.45 0.30~0.45 1.20~1.50 ≤0.030 - - - - ZG40Mn2 0.35~0.45 0.20~0.40 1.60~1.80 ≤0.030 - - - - ZG50Mn2 0.45~0.55 0.20~0.40 1.50~1.80 ≤0.030 - - - - ZG20SiMn ≤0.23 ≤0.60 1.00~1.50 ≤0.025 ≤0.30 ≤0.40 ≤0.15 - ZG35SiMn 0.30~0.40 0.60~0.80 1.10~1.40 ≤0.030 - - - - ZG35SiMnMo 0.32~0.40 1.10~1.40 1.10~1.40 ≤0.030 ≤0.30 ≤0.30 0.20~0.30 ≤0.30 ZG35CrMnSi 0.30~0.40 0.50~0.75 0.90~1.20 ≤0.030 0.50~0.80 - - - ZG20MnMo 0.17~0.23 0.20~0.40 1.10~1.40 ≤0.030 ≤0.30 ≤0.30 0.20~0.35 ≤0.30 ZG5CrMnMo 0.50~0.60 0.25~0.60 1.20~1.60 ≤0.030 0.60~0.90 ≤0.30 0.20~0.30 ≤0.30 ZG40Cr 0.35~0.45 0.20~0.40 0.50~0.80 ≤0.030 0.80~1.10 - - - ZG34CrNiMo 0.30~0.37 0.30~0.60 0.60~1.00 ≤0.025 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 ≤0.030 0.50~0.80 - 0.40~0.60 - ZG35CrMo 0.30~0.37 0.30~0.50 0.50~0.80 ≤0.030 0.80~1.20 - 0.20~0.30 - ZG42CrMo 0.38~0.45 0.30~0.60 0.60~1.00 ≤0.025 0.80~1.20 - 0.20~0.30 - ZG50CrMo 0.46~0.54 0.25~0.50 0.50~0.80 ≤0.030 0.90~1.20 - 0.15~0.25 - ZG65Mn 0.62~0.70 0.17~0.37 0.90~1.20 ≤0.030 ≤0.25 ≤0.25 - - Note: The content of residual elements is Ni≤0.30%, Cr≤0.30%, Cu≤0.25%, Mo≤0.15%, and V≤0.05%. 3 Mechanical Performance The mechanical performance of alloy steel castings after the final heat treatment shall be in accordance with those specified in Table 2. Table 2 Mechanical Performance of the Sample Under Room Temperature and Application Examples Steel grade Type of heat treatment Sectional dimension mm Mechanical performance ≥ Characteristic and use σs or σ0.2 N/mm2 σb N/mm2 δ % Ψ % Impact performance Hardness HB Ak J DV M ISO -V Charpy -U ZG40Mn Normalizing + tempering ≤100 295 640 12 30 - - - 163 Used for making parts bearing friction and impact, e.g. the gear ZG40Mn2 Normalizing + tempering, quenching and tempering ≤100 395 685 590 835 20 13 55 45 - - 35 179 269~302 Used for making parts bearing friction, e.g. the gear. ZG50Mn2 Normalizing + tempering ≤100 445 785 18 37 - - - - Used for making high strength parts, e.g. gear and rim of gear. ZG20SiMn Normalizing + tempering, quenching and tempering ≤100 295 300 510 500~650 14 24 30 - 45 39 156 150~190 With good welding and flowability, used for making ram cylinder, blade, nozzle body, valve and elbow etc. ZG35SiMn Normalizing + tempering, quenching and tempering ≤100 345 415 570 640 12 12 20 25 - - 24 27 - Used for making parts bearing friction. ZG35SiMnMo Normalizing + tempering, quenching and tempering ≤100 395 490 640 690 12 12 20 25 - - 24 27 - Used for making parts with larger load. GZ35CrMnSi Normalizing + tempering ≤100 345 690 14 30 - - - 217 Used for making parts bearing impact and abrasion, e.g. gear and roller. ZG20MnMo Normalizing + tempering ≤100 295 490 16 - - - 39 156 Used for making pressure vessel, e.g. pump case. ZG5CrMnMo Normalizing + tempering ≤100 Not specified - - - - - - With certain red hardness, used for making forging die etc. ZG40Cr Normalizing + tempering ≤100 345 630 18 26 - - - 212 Used for making high strength gear ZG34CrNiMo Quenching and tempering <150 150~250 250~400 700 650 650 950~1000 800~950 800~950 12 12 10 - - 32 28 20 - 240~290 220~270 220~270 Used for making parts with extremely high requirements, e.g. bevel gear, small gear, traveling wheel of crane and axle. ZG20CrMo Quenching and tempering ≤100 245 460 18 30 - - 24 - Used for making gear, bevel gear and high pressure cylinder parts etc. ZG35CrMo Quenching and tempering ≤100 510 740~880 12 - 27 - - - Used for making gear, axle sleeve of the electric furnace beam wheel, gear ring etc. ZG42CrMo Quenching and tempering ~30 30~100 100~150 150~250 250~400 540 490 450 400 350 740~880 690~830 690~830 650~800 650~800 12 11 10 10 8 - 27 21 16 12 9.6 - 220~260 200~250 200~250 195~240 195~240 Used for making high strength parts, gear and bevel gear etc. ZG50CrMo Quenching and tempering ≤100 520 740~880 11 - 34 - - 220~260 Used for making reducer parts gear and small gear etc. ZG65Mn Normalizing + tempering ≤100 Not specified - - - - - - Used for making the lining plate of ball mill etc. 4 Test Methods and Rules 4.1 Chemical composition analysis 4.1.1 The sample for chemical composition analysis shall be prepared during the process of pouring. 4.1.2 Chemical composition analysis shall be in accordance with the requirements of Methods for Chemical Analysis of Iron, Steel and Alloy (GB 223-81~84).

1 Manufacture 2 Chemical Composition 3 Mechanical Performance 4 Test Methods and Rules