Carbon Steel Forged Ring — Factory Direct Supplier | Huaxia-Steel

Huaxia-Steel manufactures open-die and rolled carbon steel forged rings from 300 mm to 5,000 mm outside diameter, in weights from 20 kg to 25 t per ring, in grades C45, 1045, 1050, AISI 4140, 4340, S355J2, and Q345B/Q355D. Every ring is forged with a controlled reduction ratio of 3:1 or better, heat treated to your hardness class, UT inspected per ASTM A388, and certified to EN 10204 3.1 (3.2 on request). One factory, one quality system — from ingot to machined, finish-dimensioned ring.

Product Overview

Forged rings are the backbone of rotating and pressure equipment: flanges, bearing housings, gear blanks, pressure vessel shells, slewing rings, and pipe-support collars all start life as a forged ring. Forging breaks the cast structure, closes porosity, and aligns the grain flow circumferentially — giving tangential strength and fatigue life that rolled plate and centrifugal castings cannot match. We produce by two routes: rolled ring forging (mandrel mill) for diameters up to 5,000 mm with tight tolerance and minimal machining stock, and open-die forging for heavy, irregular, or small-lot rings. Supply condition: as-forged, normalized, Q&T, or fully machined to your drawing.

Size Range & Tolerances

Parameter	Rolled Rings	Open-Die Rings
OD range	300–5,000 mm	300–3,500 mm
Wall (radial) thickness	30–500 mm	50–600 mm
Height (axial)	30–1,000 mm	60–1,200 mm
Max weight	12 t	25 t
Machining stock (as-forged)	5–15 mm per side	15–40 mm per side
Machined tolerance	ISO 2768-m (h9 on request)	ISO 2768-m
Roundness (machined)	≤0.5 mm at 2,000 mm OD	≤1.0 mm at 2,000 mm OD

Steel Grades & Heat Treatment

Grade	Equivalent	Delivery Condition	Typical Hardness
C45 / 1045	1.0503 / AISI 1045	N or Q&T	160–200 HB / 220–260 HB
1050 / 1053	AISI 1050	Q&T	240–300 HB
4140 / 42CrMo4	1.7225	Q&T	240–320 HB
4340 / 34CrNiMo6	1.6582	Q&T	280–360 HB
S355J2	1.0577	N (+ impact at -20°C)	150–190 HB
Q345B / Q355D	GB/T 1591	N or TMCP	140–180 HB

Heat treatment is performed in gas-fired and electric furnaces with load-mapped temperature uniformity (±10°C), documented on time-temperature charts included with each certificate. Normalizing, quenching (water/oil/polymer), tempering, and stress-relieving cycles are set per grade, section thickness, and target property class — tell us the environment (temperature, impact, fatigue) and we propose the condition.

Manufacturing Standards

• Forging and delivery per ASTM A668, EN 10250, DIN 7526 practice, or customer-specific forging specifications.
• Ultrasonic testing per ASTM A388 / EN 10228-3 (acceptance class stated on PO); magnetic particle per ASTM E709 for machined surfaces.
• Mechanical testing: tensile, impact (Charpy V at service temperature), hardness mapping, grain size per ASTM E112.
• Certificates: EN 10204 3.1 standard; 3.2 with third-party witness (TÜV, LR, DNV) available.

Applications

• Weld-neck and slip-on flange blanks, anchor and orifice flange rings
• Gear blanks, sprocket rims, and slewing bearing races
• Pressure vessel shells, autoclave rings, and heat exchanger components
• Wind turbine yaw/pitch components and tower flanges
• Bearing housings, cylinder heads, and hydraulic press cylinder collars
• Pipe supports, wear rings, and kiln tyre blanks

Quality Assurance

Each ring carries full heat traceability from ingot/continuous cast source through forging and heat treatment. Standard testing package: chemistry check against grade limits, tensile test on quenched-and-tempered prolongation or sacrificial ring section, 100% UT on the finished ring (report with defect mapping), hardness survey at 4–8 points, and dimensional report. First-article rings for new customers are offered with video inspection calls. Our forging shop runs ISO 9001 and PED-compliant quality systems for pressure-retaining applications.

Packing & Delivery

Rings are shipped individually crated or on steel skids with rust-preventative coating (VCI paper or strippable film), machined faces protected by wooden guards. Forgings up to 12 t ship in flat-rack or break-bulk by arrangement with marine-grade lashing. Lead time: 25–40 days for rolled rings from stock billet, 40–60 days for open-die and Q&T rings including testing; air-freight test coupons ahead of the shipment are available for project-critical schedules.