705 steel round - alloyed machinery steel
OTAI SPECIAL STEEL is 705 alloy steel stockholders and suppliers from China. more than 25 years of experience in 705 alloy steel round bar supply.
705 steel is an alloyed machinery steel with good hardenability, even in heavier sizes. It is supplied tough hardened with no further heat treatment required, but it can be oil hardened to higher mechanical properties if needed. It is suitable for induction hardening and can also be nitrided or tuffrided to a surface hardness of 600-650 Vickers.
705 alloy steel properties as below:
ASSAB 705M is not suitable for welding but can with certain precautions be repaired welded.
AISI /SAE 4340, DIN 34CrNiMo6, W.nr. 1.6582, BS 817M40 (EN 24), AFNOR 35NCD6, JIS SNCM8, SS 2541
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- Round
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- sheet
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- Square
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- Plate
Chemical composition
| C(％) | 0.37～0.44 | Si(％) | 0.15～0.35 | Mn(％) | 0.50～0.90 | P(％) | ≤0.040 |
| S(％) | ≤0.030 | Cr(％) | 0.65～0.95 | Mo (％) | 0.20～0.30 | Ni(％) | 1.55～2.00 |
Mechanical Properties
Hardness, Rockwell C: 22 HRc, Density: 7.85kg/m3
Tensile strength: 655 MPa .
Melting point: 1416°C
Thermal expansion: 12.2 µm/m°C (20-100 ºC)
Elastic modulus: 190-210 GPa (at 25 ºC ).
Forged of 705 Oil and Gas industry Steel material metal
Forged 705 steel at 1150-1200 ºC. no forging when below 850 ºC.
Heat Treatment of 705 Alloy Steel
- Annealing
Slowly heat to 800～8500 ºC, keep enough time, ensure heat thoroughly. then cooling in furnace to 480 ºC, then cool in air. After annealing, the hardness 92 HBS Max.
- Hardening & Quenching
705 Steel is usually used at 18-22 HRc, If needs, 705 alloy steel can be hardened or Quenching by cold work. Quenching medium: oil
- Tempering
/ ℃ tempering temperature: 205 ~ 649°C.
After tempering hardness HRC: 18-25 HRc.
Certification
705 alloy steel is available with a cast and analysis certificate or a BS EN 10204 3.1 mill certificate, please request when placing any orders.
Quality Assured Supply
705 steel round is supplied in accordance with our ISO 9001 : 2023 registration.
Contact our experienced sales team to help you with your 705 steel round questions and inquiry by Email or telephone. The questions will be replied in 24 hours.
Email: jack@otaisteel.com
Tel: +86-769-2319-0193
Fax: +86-769-88705839