Import 34crnimo6 Customized Large Diameter Ring — Buy in wholesale FOB from Supplier in China

34CrNiMo6 is a quenched-and-tempered high-tensile alloy steel in the European DIN designation system, combining 1.5% chromium, 1.3% nickel, and 0.3% molybdenum to deliver deep hardenability, high fatigue strength, and toughness at strength levels exceeding 1000 MPa. Jiangsu Rongcheng Forgings Co., Ltd. produces this grade as customized large-diameter seamless rings through a hot-rolling ring-rolling process, achieving diameters from 400mm to 4500mm and unit weights up to 5 tonnes. The forging is supplied after full heat treatment and machining, with test coverage including chemical composition, mechanical properties, Charpy impact, grain size, dimensional verification, ultrasonic testing, and hardness.

The 34CrNiMo6 chemistry positions it as a direct equivalent to AISI 4340 modified with slightly higher nickel and molybdenum, optimizing performance in heavy-section components where through-thickness properties must remain uniform. Ring-rolled construction eliminates the welded seam weakness of fabricated rings, providing continuous grain flow that enhances resistance to circumferential stress in flange and bearing applications. Typical delivery conditions are quenched and tempered to a specified hardness range, though the exact tempering temperature and resulting mechanical properties must be agreed per purchase order since the grade spans a wide property window depending on section size and cooling rate.

Primary demand originates from wind-energy main-bearing races, heavy-machinery slew rings, automotive press frames, construction equipment pivot joints, and power-generation turbine retaining rings. The supplier's capacity extends to 4500mm outer diameter, accommodating the largest wind-tower flange requirements without segmentation. Buyers should confirm whether the quoted ring is delivered as-forged, rough-machined, or finish-machined to drawing, as this determines the subsequent machining allowance and final cost structure. Heat treatment, test sampling location, and NDE acceptance criteria require explicit agreement before production release.

Jiangsu Rongcheng Forgings Co., Ltd. is located at No. 589, Yangjin Road, Jinfeng Town, Zhangjiagang, Jiangsu Province 215600, within China's densest concentration of heavy forging and ring-rolling capacity. The trust tier is harbor, indicating a baseline marketplace presence without premium verification, and both response rate and average response hours register at zero, suggesting limited active inquiry management through standard digital channels. Buyers should anticipate that direct engagement may require persistent follow-up or alternative contact routes such as telephone or trade-fair meetings rather than relying solely on platform messaging.

The company's stated capability spans 400mm to 4500mm ring diameters and 5 tonnes maximum weight, supported by forging, ring rolling, heat treatment, and machining operations. No specific press tonnage, ring-rolling mill configuration, or furnace capacity is disclosed, so buyers evaluating technical fitness should request facility details and quality-system accreditation status. The breadth of alternative grades offered, from carbon steels through stainless to bearing steel Gr15, indicates a flexible forging shop rather than a 34CrNiMo6 specialist; this is advantageous for project sourcing but may necessitate closer scrutiny of heat segregation, material certification, and process control for any specific grade order. The profile does not mention ISO 9001, IATF 16949, or third-party approvals, so buyers should ask for current certificates and audit status.