30CrMnSiA 30KHGSА 30ХГСА Cold Heading Steel Wire GB /T 3077-1999 A24303
Henan Friend Metal Products Co., Ltd. is one of the leading manufacturers and suppliers of 30crmnsia 30khgsа 30хгса cold heading steel wire gb /t 3077-1999 a24303 in China. If you're going to buy 30crmnsia 30khgsа 30хгса cold heading steel wire gb /t 3077-1999 a24303 made in China, welcome to get more information from our factory. We also accept customized orders.
30CrMnSiA cold-heading steel wire is a high-strength alloy structural steel product conforming to GB/T 3077 standard (Russian equivalents: 30KHGSА/30ХГСА). With a carbon content of ~0.3% and alloying elements including chromium, manganese, and silicon, it achieves a minimum tensile strength of 1080 MPa after quenching and tempering. This treatment delivers an optimal balance of high toughness, fatigue resistance, and cold formability.
Engineered for cold-heading operations, this wire is ideal for manufacturing critical load-bearing components such as aerospace fasteners, high-strength bolts/nuts, and automotive powertrain parts. It maintains structural integrity across a wide temperature range (-40°C to 425°C), making it suitable for demanding environments.
Cold-drawn to precise tolerances (±0.02mm diameter), the wire surface is available in either bright or black-oxide finishes to meet diverse application needs. Its exceptional dimensional stability and surface quality ensure consistent performance in precision machining processes. Widely used in industries requiring rigorous strength and reliability standards, this alloy wire delivers dependable performance under extreme conditions.
Chemical element composition of 30CrMnSiA(%)
| Composition | C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
|---|---|---|---|---|---|---|---|---|---|
| Min | 0.28 | 0.9 | 0.8 | - | - | 0.8 | - | - | - |
| Max | 0.34 | 1.2 | 1.1 | 0.025 | 0.025 | 1.1 | 0.3 | 0.25 | 0.1 |
mechanical property
| Sample diameter d mm |
Heat treatment or state | Tensile strength σb Mpa |
Yield point σs Mpa |
Elongation δ % |
Reduction of area ψ % |
Hardness HBW |
Impact absorbed energy KV2 J |
|---|---|---|---|---|---|---|---|
| d=25 | Quenching + tempering | ≥1080 | ≥835 | ≥10 | ≥45 | ≤229 | ≥39 |
Heat treatment temperature adjustment range:
- Quenching: ±15°C
- Low-temperature tempering: ±20°C
- High-temperature tempering: ±50°C
The mechanical properties listed in the table apply to steel with a cross-sectional size ≤80 mm:
- For steel with sizes >80 to 100 mm:Elongation after fracture, reduction of area, and impact absorbed energy are permitted to be reduced by 1% (absolute value), 5% (absolute value), and 5%, respectively, compared to the specified values in the table.
- For sizes >100 to 150 mm:Reductions are 2% (absolute value), 10% (absolute value), and 10%, respectively.
- For sizes >150 to 250 mm:Reductions are 3% (absolute value), 15% (absolute value), and 15%, respectively.
For boron steel, normalizing can be performed before quenching:
- The normalizing temperature shall not exceed the quenching temperature.
- For chromium-manganese-titanium steel, normalizing can replace the first quenching.
In tensile testing, if no yield point is observed on the test specimen and the yield point σₛ cannot be determined:
-
The specified residual extension stress σᵣ₀.₂ shall be measured instead.
The hardness values in the table are Brinell hardness (HB10/3000) for steel supplied in the annealed or high-temperature tempered state.
Heat treatment process:
- Quenching temperature: 880°C, oil cooling
- Tempering temperature: 540°C, water cooling or oil cooling
Examples of Machinable Fastener Products
| Processable Products of (ML)30CrMnSiA Steel (Compliant with GB3077/3078/3079/5953.1/5954; GJB1951/2150A/2151) |
|||
| Name | Type | Performance rate | Specification |
| Stud Bolt | GB 901-1988 | 10.9 | M24 |
| Knurled Thumb Screw | GB 900-1988 | 10.9 | M8~M12 |
| Cross Recessed Countersunk Head Screw | GB/T 819.2-1997 | 8.8,10.9(Exceeded) | M1.6~M8 |
| GB/T 819.1-2000 | 8.8,10.9(Exceeded) | M1.6~M6 | |
| Phillips Pan Head Screw | GB/T 818-2000 | 8.8,10.9,12.9(Exceeded) | M1.6~M8 |
| Hex Socket Head Cap Screw | GB/T 70.1-2000 | 8.8,10.9,12.9 | M2~M20 |
| Hexagon bolt | GB/T 5783-2000 | 8.8,10.9 | M3~M20 |
| Type 1 Hex Nut | GB/T 6170-2000 | 6,8,10,30~36HRC | M2~M36 |
| GB 41-1986 | 5 | M8~M18 | |
| Type 1 Hex Nut, Fine Thread | GB/T 6171-2000 | 8,10,12 | M6~M24 |
Similar materials
| China | Russia | |
| GB | ISC | GOST |
| 20CrMnSi 30CrMnSi 35CrMnSiA |
A24202 A24302 A24303 |
20ХГС 30ХГС 35ХГСА |
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