Spring Alloy Steel Round Bar Cold Drawn Hot Rolled Excellent Polishability

Spring steels from VANFORGE are mainly used for the hot formed springs such as the laminated springs, coiled springs, and torsion bar springs.

Methods of manufacture

1. The steels are manufactured of killed steel ingots.
2. The hot rolled steels unless otherwise specified shall be supplied in the as-rolled or another as worked conditions. The Brinell hardness for the steel flats shall be generally 302 or less.
3. The cold worked steels shall be made of the hot rolled steels by cold drawing, cutting, grinding or the combined these processes as specified.

Steel grades

Chemical composition, %

Remarks:

1. As impurities, Cu content for each grade shall not exceed 0.30%

Appearance

The steels shall be well finished and free from defects that are detrimental to practical use.

Decarburization

Steels shall be free from decarburization that is detrimental to practical use. The allowable limit for the depth of decarburization may be agreed upon between the purchaser and the manufacturer.

Inspection

1. The general requirements for inspection shall conform to JIS G0303
2. The test results on chemical composition, appearance, decarburization, shape and dimensions shall conform to the requirements of 4, 5 and 6 of JIS G4801
3. Besides the inspection items specified in 8.2 of JIS G4801, the purchaser may specify the necessary matters among those specific inspection items as shown in the following. In this case, the purchaser shall previously agree with the manufacturer as to the inspection item, sampling method, test method and acceptance criteria.

Grain size examination conforms to JIS G0551

Macro-structure examination conforms to JIS G0553

Non-metallic inclusions examination conforms to JIS G0555

Macro-streak-flaw examination conforms to JIS G0556

Hardenability test conforms to JIS G0561

Magnetic particle examination conforms to JIS G0565

Mechanical properties test conforms to JIS Z2201, Z2241, Z2243

Marking

Each bundle of the steels shall be marked the following items. However, the hot rolled steel bar whose diameter exceeds 30mm shall be legibly marked on each product when requested. However, when approval by the purchaser, a part of the items may be omitted.

Designation of grade

Charge number or inspection number

Manufacturer’s name or its identifying brand

Product size range
Diameter: 40mm - 150mm
Length: on request

Production Process





Key clients

Suzhou Vanforge Metals Co., Ltd. was set up in April 1999 with a registered capital of 230 million Yuan in Zhangjiagang Bonded Area in Jiangsu Province of China. It has developed to be an important R&D and manufacture enterprise of high performance stainless steels and nickel alloys.

Vanforge is a high-tech enterprise with 70 national patents, it has its own Special Alloy Research Center, academician workstation and post doctorate innovation practice base. Vanforge has been certificated the national laboratory accreditation of ISO/IEC 17025, and ISO9001, ISO14001, OHSAS18001, API Q1, IATF16949, GB/T23331, TUV, CCS, DNV, LR, ABS.

Vanforge has the international advanced special smelting capacity, including the German ALD 6t vacuum induction furnace, 6t consumable electrode vacuum furnace, 18t drawing-ingot protective atmosphere electroslag furnace and 1t vacuum induction furnace, 3t electroslag furnace, 18t drawing-hollow ingot electroslag furnace, and 2# Purification Furnace/1# Purification Furnace/LF/AOD/VOD refining production line, 25MN/8MN fast forging machine, 450/320 rolling mill, etc.

The current annual production capacity of Vanforge is 120,000 tons, and the main products are high-grade special alloy materials, including high temperature alloy, corrosion resistant alloy, precision alloy, ultra high strength steel, special stainless steel, high-grade tool and mould steel, steam turbine blades steel, gas turbine steel, ultra-supercritical materials, etc., which are widely used in aviation, aerospace, ship, petrochemical, nuclear power, electronics, steam turbine, high-speed rail, machinery manufacturing, and other fields; besides, we can organize the research and development and production of new materials according to customer demand for new materials. Vanforge has now become a qualified supplier of domestic high-end equipment manufacturing enterprises, such as CASIC, CGN, CRRC, CFHI, Wujin Stainless, Zhejiang Jiuli Hi-Tech Metals Co., Ltd., Xinxing Ductile Iron Pipe Co., Ltd., etc.

We always adhere to the concept of quality first, integrity based, scientific and technological innovation, making progress, and wholeheartedly serving customer and devote ourselves to becoming the well-known supplier of key basic materials of world’s high-end equipment manufacturing industry.

We supply following products in the forms of wires, bars, plates

(Super) austenitic stainless steels

(Super) duplex stainless steels

(Supper) Ferritic stainless steels

Precipitation hardening stainless steels

Incoloy alloys

Inconel alloys

Monel alloys

Hastelloy alloys

As well as following steel products

Gear steels

Bearing steels

Spring steels

Drilling tool steels

Free-cutting steels

Anchor steels, mooring chain steels

Mining chain steels

Die steels, Mold steels, tool steels

Structural steels

Antiwear steels

Offshore structure steels

Petroleum storage tank steels