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30CrMnSiA (Equivalent to Russian 30KhGSA) Quenched & Tempered Alloy Steel Round Bar
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xProduct Details
| Products Name | Alloy Steel Round Bar | Diameter | 10 - 300mm |
|---|---|---|---|
| Length | 6m | Tech | Hot Rolled |
| Service | Cutting | MOQ | 1 Ton |
| Loading Port | Shanghai Port | Standard | ASTM EN GB |
Product Description
30CrMnSiA (Equivalent to Russian 30KhGSA) Quenched & Tempered Alloy Steel Round Bar
Products Specification
|
Products Name |
30CrMnSiA Alloy Steel Round Bar |
|
Diameter |
10 - 300 mm |
|
Length |
6m or custom cutting any length as request |
|
Type |
Hot Rolled |
|
Brand |
BAOSTEEL DELTA DONGBEI HUAXI SHAGANG.etc |
|
MOQ |
1 Ton |
|
Loading Port |
Shanghai Port |
|
Packing |
packing by steel wire rope |
|
Deliver time |
5 - 7 days for stock materials |
|
Other Grade |
Q195,Q235,10#,20#,35#,45#,Q215,Q345,12Cr1Mov,15CrMo ,20Cr,40Cr,20CrMo,35CrMo,42CrMo,40CrNiMo,GCr15,65Mn,50Mn, 50Cr,3Cr2W8V,20CrMnTi,25Cr2MoVA,5CrMnMo ,38CrMoAl, 30CrMnSiA,31CrMoV9 |
|
Standard |
ASTM GB EN DIN |
|
Application |
Structure and Industrial |
Standard Size of our Steel Round Bar In Stock
| 10mm | 12mm | 15mm | 16mm | 18mm | 20mm |
| 25mm | 30mm | 35mm | 38mm | 40mm | 42mm |
| 45mm | 48mm | 50mm | 55mm | 60mm | 65mm |
| 70mm | 75mm | 80mm | 85mm | 90mm | 95mm |
| 105mm | 110mm | 115mm | 120mm | 130mm | 140mm |
| 150mm | 160mm | 170mm | 180mm | 190mm | 200mm |
| 210mm | 220mm | 230mm | 240mm | 250mm | 260mm |
| 270mm | 280mm | 290mm | 300mm | 310mm | 320mm |
Product Introduction
The 30CrMnSiA quenched and tempered (Q&T) alloy steel round bar is a premium-grade structural steel renowned for its exceptional combination of high tensile strength, impact toughness, fatigue resistance, and wear performance. Widely specified in demanding sectors such as aerospace, defense, heavy machinery, and oil & gas, this material is the Chinese counterpart to the Russian GOST standard 30KhGSA (30ХГСА)—ensuring global interchangeability and reliability.
Through controlled quenching and tempering, 30CrMnSiA achieves a refined microstructure that delivers superior mechanical properties across a wide diameter range (typically 10 mm to 300 mm), making it ideal for critical load-bearing components subjected to dynamic stress, shock loading, or high-cycle fatigue.
Key Features & Benefits
- ✅ Ultra-High Strength: Tensile strength up to 1,250 MPa after Q&T treatment
- ✅ Excellent Low-Temperature Toughness: Impact energy >47 J at 20°C (often higher at room temp)
- ✅ Good Hardenability: Uniform properties even in large cross-sections (up to Φ300 mm)
- ✅ Wear & Fatigue Resistant: Suitable for gears, shafts, and high-stress fasteners
- ✅ Global Equivalence: Directly comparable to Russian 30KhGSA, and functionally similar to AISI 4140/4340 in many applications
- ✅ Controlled Cleanliness: Low sulfur and phosphorus content minimizes inclusions and enhances ductility
Chemical Composition (GB/T 3077 – China | GOST 4543 – Russia)
| Element | C | Si | Mn | Cr | Ni (max) | Cu (max) | P (max) | S (max) |
|---|---|---|---|---|---|---|---|---|
| 30CrMnSiA / 30KhGSA | 0.28–0.34 | 0.90–1.20 | 0.80–1.10 | 0.80–1.10 | ≤0.30 | ≤0.30 | ≤0.025 | ≤0.025 |
Note: The chemical composition of 30CrMnSiA and 30KhGSA is virtually identical, ensuring metallurgical compatibility.
Mechanical Properties (Quenched & Tempered Condition)
| Property | Typical Value Range | Test Standard |
|---|---|---|
| Tensile Strength (Rm) | 1,080 – 1,250 MPa | GB/T 228 / ISO 6892 |
| Yield Strength (Rp0.2) | ≥ 835 MPa | GB/T 228 |
| Elongation (A5) | ≥ 10% | GB/T 228 |
| Reduction of Area (Z) | ≥ 45% | GB/T 228 |
| Impact Toughness (Akv) | ≥ 47–63 J @ 20°C | GB/T 229 / ISO 148 |
| Hardness (HBW) | 290 – 340 | GB/T 231 |
Properties can be fine-tuned via tempering temperature adjustments (e.g., higher toughness at 550–600°C; higher strength at 450–500°C).
Product Specifications
| Parameter | Details |
|---|---|
| Material Grade | 30CrMnSiA (China, GB/T 3077) ≡ 30KhGSA (Russia, GOST 4543) |
| Condition | Quenched & Tempered (Q&T) |
| Form | Precision round bar (hot rolled + Q&T, or forged + Q&T) |
| Diameter Range | 10 mm – 300 mm (standard); larger diameters available on request |
| Length | 2,000 – 6,000 mm (custom cut-to-length service offered) |
| Surface Finish | Black oxide (as-Q&T), peeled, ground, or polished |
| Straightness | ≤ 1.5 mm/m (for precision grades) |
| Tolerance | h9, h11, or per customer drawing (ISO 286 / GB/T 1800) |
| Certification | EN 10204 3.1 / 3.2 Mill Test Report, RoHS/REACH compliant |
| Inspection | Ultrasonic testing (UT), hardness profiling, macro/microstructure check |
Heat Treatment Process (Standard Q&T Cycle)
- Austenitizing: Heat to 880–920°C in controlled atmosphere furnace
- Quenching: Oil quench (agitated) for optimal cooling rate and minimal distortion
- Tempering: 450–600°C for 1.5–2 hours, followed by air cooling
- Lower tempering temp (450–500°C) → higher strength, moderate toughness
- Higher tempering temp (550–600°C) → improved toughness, slightly reduced strength
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