What is 35KHM steel?
35KHM — written 35ХМ in the original Cyrillic GOST designation — is a high-tensile chromium-molybdenum (Cr-Mo) alloy structural steel defined by GOST 4543-71. The chromium and molybdenum additions give it good hardenability, high strength and reliable toughness after quenching and tempering, which is why it is a common choice for forged components that carry load or pressure.
At Jiangyin Jiangnan Metal, 35KHM is melted using an EAF + VOD + ESR route for clean, low-inclusion material, then open-die forged and heat-treated to the condition your application requires — annealed, normalized, or hardened and tempered.
International grade equivalents
35KHM (35ХМ) is commonly cross-referenced to the grades below. They are close relatives rather than exact matches — always confirm equivalence against your own specification before substituting.
- China (GB)
- 35CrMo
- EN / Germany
- 34CrMo4 · 1.7220
- USA (AISI)
- 4135 / 4137
- Japan (JIS)
- SCM435
Chemical composition of 35KHM
Composition per GOST 4543-71, weight %. Mill-certified values are reported on the EN 10204 certificate for each heat.
| C | Si | Mn | Cr | Mo | Ni | Cu | S | P |
|---|---|---|---|---|---|---|---|---|
| 0.32–0.40 | 0.17–0.37 | 0.40–0.70 | 0.80–1.10 | 0.15–0.25 | ≤ 0.30 | ≤ 0.30 | ≤ 0.035 | ≤ 0.035 |
Chromium and molybdenum (highlighted) are the defining alloying elements; sulphur and phosphorus are held low for cleanliness and forgeability.
Mechanical properties of 35KHM forgings
Longitudinal properties for forgings after quenching from 850–880 °C in oil and tempering (drawing) at 585–650 °C, per GOST 4543-71. Values ease with increasing section thickness.
| Product | Max section (mm) |
Direction | Tensile σB (MPa) |
Yield σT (MPa) |
δ5 (%) |
ψ (%) |
KCU (kJ/m²) |
|---|---|---|---|---|---|---|---|
| Forging | ≤ 100 | longitudinal | 950 | 750 | 13 | 42 | 650 |
| Forging | ≤ 120 | longitudinal | 900 | 710 | 13 | 42 | 650 |
| Forging | ≤ 150 | longitudinal | 800 | 600 | 14 | 45 | 650 |
| Forging | ≤ 200 | longitudinal | 700 | 500 | 16 | 45 | 600 |
σB = ultimate tensile strength · σT = yield strength · δ5 = elongation · ψ = reduction of area · KCU = impact toughness. Heat treatment for all rows: quench 850–880 °C (oil) + temper 585–650 °C.
Melting & heat treatment
Melting route
35KHM is produced by EAF + VOD + ESR (electric-arc furnace, vacuum oxygen decarburization, then electro-slag remelting). This route lowers gas and inclusion content and improves the uniformity and forgeability of the ingot before open-die forging.
Heat-treatment conditions available
- Annealed — for machinability and a stable microstructure prior to final treatment.
- Normalized — for a refined, uniform grain structure.
- Hardened & tempered (Q&T) — typically quench 850–880 °C in oil, then temper 585–650 °C to reach the required strength and toughness for the section size.
The exact cycle is chosen to meet the mechanical properties and section thickness specified on your drawing.
35KHM forged products we manufacture
Made to your drawing or dimensions as open-die forgings and seamless rolled rings. Send a size or drawing for a quotation.
Typical applications
Because of its strength and toughness, 35KHM forgings are used across pressure, power and heavy-machinery industries.
Pressure & heat exchange
Pressure vessels, air receivers, shell-and-tube heat exchangers, forged tube sheets, flanges and rings.
Columns & process modules
Columns, towers, tanks, silos, preheaters and process skids.
Oil & gas
Subsea and deepwater production systems, wellhead and Christmas-tree parts, compressors and generators.
Valves
Forged valve seat rings, bodies, stems and blocks for ball, gate, globe, check and plug valves.
Power transmission
Shafts, spindles, gears and rolls for turbines, gas compressors and gear boxes.
Pumps & mills
Chemical, plunger and process pump parts; cement, sugar and concrete mill components.
Testing, inspection & certification
- Ultrasonic testing (UT) to EN 10228-3, SEP 1921 or ASTM A388, as specified.
- Chemical & mechanical verification reported per heat.
- EN 10204 3.1 mill certificate, or EN 10204 3.2 third-party certificate on request.
Additional non-destructive testing and customer or third-party witness inspection can be arranged to your project requirements.
Frequently asked questions about 35KHM
What is 35KHM steel?
35KHM (GOST designation 35ХМ) is a high-tensile chromium-molybdenum (Cr-Mo) alloy structural steel to GOST 4543-71. It combines about 0.32–0.40% carbon with 0.80–1.10% chromium and 0.15–0.25% molybdenum, giving good hardenability, strength and toughness after quenching and tempering. It is widely forged into rings, flanges, shafts, discs and bars.
What is the chemical composition of 35KHM?
C 0.32–0.40%, Si 0.17–0.37%, Mn 0.40–0.70%, Cr 0.80–1.10%, Mo 0.15–0.25%, Ni max 0.30%, Cu max 0.30%, S max 0.035%, P max 0.035%.
What international grades are equivalent to 35KHM?
35KHM (35ХМ) is commonly cross-referenced to 35CrMo (China GB), 34CrMo4 / 1.7220 (EN), AISI 4135 / 4137 (US) and SCM435 (JIS). These are close but not identical — confirm equivalence against your specification before substitution.
What forged products can be made in 35KHM?
Open-die forgings and seamless rolled rings: forged rings, rolled rings, flanges, round bars, discs, gears, shafts, sleeves, bushings, pipes, tube sheets and forged blocks — made to your drawing or dimensions.
How is 35KHM heat treated?
It can be supplied annealed, normalized, or hardened and tempered. A typical quench-and-temper cycle is quenching from 850–880 °C in oil followed by tempering at 585–650 °C, selected to meet the required mechanical properties for the section size.
What testing and certification do you provide?
35KHM forgings are ultrasonically tested to EN 10228-3, SEP 1921 or ASTM A388, and can be supplied with an EN 10204 3.1 mill certificate or an EN 10204 3.2 third-party certificate.
Who manufactures and supplies 35KHM forgings?
35KHM forgings are manufactured by Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. Contact +86-189-2135-9659 or sales@steelforgepieces.com for a quotation.
About the manufacturer
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China. We manufacture open-die forgings and seamless rolled rings — rings, flanges, shafts, discs, gears, bars and pipes — across carbon, alloy, tool, stainless and nickel-alloy grades, including 35KHM (35ХМ).
Send us the size or drawing of the 35KHM forging you need and we will quote our best price. We supply worldwide and can certify to EN 10204 3.1 or 3.2.
Technical data on this page last reviewed September 2026.