English 
简体中文 
CN
| Property | Parameter | Description |
|---|---|---|
| Product Name | 42CrMo Alloy Steel Bar | Chromium-molybdenum alloy steel for high-strength applications |
| Material Grade | 42CrMo / AISI 4140 / EN 1.7225 / JIS SCM440 | International grade equivalents |
| Standard Compliance | GB/T 3077, ASTM A29, EN 10083-3, JIS G4105 | Meets major international standards |
| Carbon (C) | 0.38-0.45% | Carbon content for strength and hardenability |
| Chromium (Cr) | 0.90-1.20% | Enhances hardenability and wear resistance |
| Molybdenum (Mo) | 0.15-0.25% | Improves toughness and high-temperature strength |
| Manganese (Mn) | 0.50-0.80% | Increases strength and hardenability |
| Silicon (Si) | 0.17-0.37% | Deoxidizer and strengthening element |
| Phosphorus (P) | ≤0.035% | Controlled for improved ductility |
| Sulfur (S) | ≤0.035% | Low sulfur for better machinability |
| Tensile Strength | ≥1080 MPa | Minimum tensile strength after heat treatment |
| Yield Strength | ≥930 MPa | Minimum yield strength after quenching and tempering |
| Elongation | ≥9% | Ductility in 50mm gauge length |
| Hardness | 217-269 HBW | Brinell hardness after annealing |
| Diameter Range | 10mm - 350mm | Available round bar diameter options |
| Length | 3m - 12m or custom | Standard and custom lengths available |
| Heat Treatment | Quenched and Tempered (QT) | Delivered in heat-treated condition |
| Application | Gears, shafts, crankshafts, heavy machinery parts | Typical application in mechanical engineering |
| Certification | EN 10204 3.1, ISO 9001, mill test certificate | Quality certifications provided |
| MOQ | 5 tons | Minimum order quantity |
Acceptable Quality with Initial Documentation Delay
Ordered 5 tons of 42CrMo bars (55mm diameter, hot-rolled) for general machinery parts. Material quality was acceptable - mechanical properties met GB/T 3077 standards with tensile strength at 1082 MPa. Initial shipment arrived without complete mill certificates, causing a 3-day delay in our production schedule. Supplier quickly sent missing documentation via courier and offered 5% discount on our next order as compensation. Once resolved, material performed adequately in our manufacturing process. Straightness was within tolerance at 2mm per meter. Would order again given the responsive customer service in resolving the issue.
Ordered 5 tons of 42CrMo bars (55mm diameter, hot-rolled) for general machinery parts. Material quality was acceptable - mechanical properties met GB/T 3077 standards with tensile strength at 1082 MPa. Initial shipment arrived without complete mill certificates, causing a 3-day delay in our production schedule. Supplier quickly sent missing documentation via courier and offered 5% discount on our next order as compensation. Once resolved, material performed adequately in our manufacturing process. Straightness was within tolerance at 2mm per meter. Would order again given the responsive customer service in resolving the issue.
