Chrome Moly GOST 35KHMAlloy Steel Bars

Name: Chrome Moly GOST 35KHMAlloy Steel Bars
Brand: JAYANT IMPEX
Price: 74.0 INR
Availability: InStock

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Product Details:

Processing Heat Treatment, Normalizing, Tempering
Application Engineering, Construction, Oil & Gas, Power Plants, Automotive
Type Alloy Steel Bars
Specific Use Structural Bars, Shafts, Machine Components
Diameter 10 mm to 300 mm
Technique Hot Rolled / Forged
Material Chrome Moly Alloy Steel
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Chrome Moly GOST 35KHMAlloy Steel Bars Price And Quantity

Minimum Order Quantity 1 Kilograms
Price 74.0 INR/Kilograms

Chrome Moly GOST 35KHMAlloy Steel Bars Product Specifications

Length Custom cut length, typically 3m to 6m
Processing Heat Treatment, Normalizing, Tempering
Application Engineering, Construction, Oil & Gas, Power Plants, Automotive
Finish Bright, Polished, or Black
Type Alloy Steel Bars
Standard GOST 35KHM
Diameter 10 mm to 300 mm
Specific Use Structural Bars, Shafts, Machine Components
Tolerance H8, H9, H10 (as per order)
Technique Hot Rolled / Forged
Material Chrome Moly Alloy Steel
Grade 35KHM

Testing Ultrasonic, MPI, Chemical & Mechanical Test Reports
End Use Industry Heavy Engineering, Power Generation, Oilfield Equipment
Surface Condition Peeled, Ground, Polished
Hardness 28-35 HRC (custom as per request)
Shape Round, Hex, Square
Tensile Strength 980 MPa (dependent on heat treatment)
Impact Strength High, suitable for heavy-duty applications
Delivery Condition Annealed, Normalized, or Quenched & Tempered
Corrosion Resistance Enhanced with chrome & moly content
Yield Strength 830 MPa (dependent on heat treatment)

Product Description

GOST 35KhM (written in Cyrillic as 35) is a high-performance, heat-resistant, and relaxation-resistant chromium-molybdenum alloy steel specified under the Russian Interstate Standard GOST 4543.

With a carbon profile positioned around 0.35%, 35KhM is engineered primarily as a structural through-hardening and high-temperature alloy. In post-Soviet and Eastern European industrial engineering, it is heavily relied upon for machinery operating under steep mechanical stress, high rotation speeds, and continuous thermal loads reaching up to 450C 500C.

Global Equivalents

When translating a GOST blueprint or technical bill of materials to Western or Asian production standards, 35KhM aligns closely with:

USA (AISI/SAE): AISI 4135 / AISI 4137 (Sits right on the border)
Germany (DIN / WNr): 34CrMo4 / 1.7220 or 35CrMo4
Europe (EN): 34CrMo4
China (GB): 35CrMo
Japan (JIS): SCM432 / SCM435 variants
Poland (PN): 35HM

Chemical Composition (GOST 4543-71 %)

The designation tells the exact chemical story:35 ( $0.35%$ Carbon),Kh ( $text{}$ - Chromium), and M ( $text{}$ - Molybdenum). Molybdenum prevents the "temper brittleness" that commonly affects standard chromium steels when subjected to continuous operational heat.

Carbon (C)	Chromium (Cr)	Molybdenum (Mo)	Manganese (Mn)	Silicon (Si)	Nickel (Ni)	Copper (Cu)
0.32% 0.40%	0.80% 1.10%	0.15% 0.25%	0.40% 0.70%	0.17% 0.37%	0.30%	0.30%

Mechanical Properties (Quenched & Tempered state, +QT)

When supplied or treated via oil quenching ( $approx 850text{C} - 880text{C}$ ) followed by high-temperature drawing/tempering ( $approx 585text{C} - 650text{C}$ ), a typical $varnothing 25text{mm}$ test bar exhibits these minimum mechanical metrics:

Tensile Strength ( $sigma_b$ ): 930 MPa (N/mm)
Yield Strength ( $sigma_t$ ): 735 835 MPa
Elongation ( $delta_5$ ): 12% 13%
Reduction of Area ( $psi$ ): 42% 45%
Impact Toughness (KCU): 650 780 kJ/m
Delivery Condition Hardness (Annealed): Max 241 HBW (Optimized for precision peeling and turning)

Distinct Technical Attributes

Relaxation Resistance: Under sustained high thermal conditions and mechanical loading, many structural steels undergo "stress relaxation" (a gradual loss of elastic tension). 35KhM is explicitly structured to resist this, making it ideal for high-pressure connection parts.
Flake Susceptibility: Like many deep-hardening Cr-Mo steels, 35KhM can be predisposed to hydrogen flakes (internal micro-cracking) during cooling post-forging if cooling rates aren't strictly controlled by the mill.
Limited Weldability: Due to its mid-carbon content, it is categorized as possessing limited weldability. Fabrications require preheating ( $150text{C} - 250text{C}$ ) and subsequent post-weld heat treatment (PWHT) to avoid severe cracking inside the heat-affected zone.

Common Industrial Applications

35KhM round and square bars are primarily sourced for high-torque or high-pressure applications where components run hot or fast:

Heavy Machinery & Aerospace: High-speed turbine spindles, transmission shafts, heavy-duty gear sets, and engine rotors.
Petrochemical & Pipeline Infrastructures: High-integrity flanges, processing valve stems, and thick-walled stage connectors.
High-Load Fasteners: Creep-resistant stud bolts, heavy-duty nuts, structural tie-rods, and specialized double-bolted industrial clamping hardware.

Superior Alloy Steel Performance

GOST 35KHM Chrome Moly Alloy Steel Bars deliver exceptional mechanical properties, including a yield strength of 830 MPa and tensile strength of 980 MPa, both depending on heat treatment. This high-strength profile makes them a smart choice for applications requiring durability and precision, such as shafts, machine components, and heavy engineering structures.

Versatile Applications and Customization

Available in round, hex, and square shapes, these alloy steel bars meet diverse industry demands. Clients can select custom lengths, diameters, and hardness levels, with surface finishes tailored to exact requirements-peeled, ground, or polished. Typical uses include oilfield equipment, construction, and power plant hardware, supported by flexible processing and finishing options.

Stringent Quality Assurance

Every batch of 35KHM alloy steel bars is subjected to thorough testing, such as ultrasonic, magnetic particle inspection (MPI), as well as detailed chemical and mechanical test reports. This ensures each product meets rigorous quality and safety standards, providing customers confidence in their material's integrity and performance.

FAQ's of Chrome Moly GOST 35KHMAlloy Steel Bars:

Q: How are the Chrome Moly GOST 35KHM Alloy Steel Bars processed and heat treated?

A: These alloy steel bars are manufactured using hot rolling or forging techniques and can be delivered in annealed, normalized, or quenched and tempered conditions. The specific heat treatment is selected based on required mechanical properties as per customer application and standards.

Q: What applications are GOST 35KHM alloy steel bars best suited for?

A: Owing to their high yield and tensile strength, impact resistance, and enhanced corrosion resistance, these bars are widely used in heavy engineering, power generation, oilfield equipment, automotive, and construction industries.

Q: When should I opt for a specific surface condition like peeled, ground, or polished?

A: Select peeled or ground surfaces for tight dimensional tolerance or improved machinability, while polished finishes are preferred for applications demanding superior aesthetics or reduced friction. The choice depends on end use and required precision.

Q: Where can custom lengths and diameters be ordered?

A: Chrome Moly GOST 35KHM Alloy Steel Bars are available with custom length (typically 3m to 6m) and diameters from 10 mm to 300 mm as per order and industry standards. These specifications can be requested through authorized dealers, manufacturers, or suppliers throughout India.

Q: What testing is performed on these alloy steel bars?

A: Each product undergoes ultrasonic inspection, magnetic particle (MPI) testing, as well as comprehensive chemical and mechanical testing, ensuring they meet stringent quality parameters for critical engineering applications.

Q: How does the alloy composition benefit end users?

A: The addition of chromium and molybdenum significantly enhances the bars' corrosion resistance, mechanical strength, and longevity, thus reducing maintenance frequency and improving performance in harsh or demanding operational environments.

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