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FORGE-RB
ETERNAL
17-4 stainless steel round bar is an important steel material in many fields , it would be forged
with excellent raw material .
17-4 ( SUS630 ) chemical specification :
Ni：3.00～5.00 Cu：3.00～5.00 Nb：0.15～0.45
Mechanical property and heat treatment
SUS630 alloy is a stainless steel with precipitation, quenching, and martensitic properties,
and this grade has high strength, hardness, and corrosion resistance. After heat treatment,
the mechanical properties of the product are more perfect, reaching a compressive strength
of up to 1100-1300 MPa (160-190 ksi). This grade cannot be used at temperatures above
300 ℃ (570F) or very low temperatures. It has good corrosion resistance to the atmosphere
and diluted acids or salts, and its corrosion resistance is the same as 304 and 430.
mechanical property
Tensile strength σ b (MPa): Aged at 480 ℃, ≥ 1310; 550 ℃ aging, ≥ 1060; 580 ℃ aging, ≥ 1000;
620 ℃ aging, ≥ 930
Conditional yield strength σ 0.2 (MPa): aging at 480 ℃, ≥ 1180; 550 ℃ aging, ≥ 1000; 580 ℃ aging,
≥ 865; 620 ℃ aging, ≥ 725
Elongation rate δ 5 (%): aging at 480 ℃, ≥ 10; 550 ℃ aging, ≥ 12; 580 ℃ aging, ≥ 13; 620 ℃ aging, ≥ 16
Shrinkage rate of cross-section (%): Aged at 480 ℃, ≥ 40; 550 ℃ aging, ≥ 45; 580 ℃ aging, ≥ 45; 620 ℃ aging, ≥ 50
Hardness: Solid solution, ≤ 363HB and ≤ 38HRC; 480 ℃ aging, ≥ 375HB and ≥ 40HRC; 550 ℃ aging, ≥ 331HB and ≥ 35HRC; 580 ℃ aging, ≥ 302HB and ≥ 31HRC; 620 ℃ aging, ≥ 277HB and ≥ 28HRC
Heat treatment process
Heat treatment specifications:
(1) Quick cooling at 1020-1060 ℃ for solid solution;
(2) Aging at 480 ℃, after solid solution treatment, air-cooled at 470-490 ℃;
(3) Aging at 550 ℃, after solid solution treatment, air-cooled at 540-560 ℃;
(4) Aging at 580 ℃, after solid solution treatment, air-cooled at 570-590 ℃;
(5) Aging at 620 ℃, after solid solution treatment, air-cooled at 610-630 ℃. Metallographic structure: characterized by precipitation hardening.
Size : diameter upto 600mm , length upto 8000mm
Delivery condition :
Forging + black
Forging + peeled surface
Forging + solution + peeled surface
Forging + solution + aging + peeled surface
17-4 stainless steel round bar is an important steel material in many fields , it would be forged
with excellent raw material .
17-4 ( SUS630 ) chemical specification :
Ni：3.00～5.00 Cu：3.00～5.00 Nb：0.15～0.45
Mechanical property and heat treatment
SUS630 alloy is a stainless steel with precipitation, quenching, and martensitic properties,
and this grade has high strength, hardness, and corrosion resistance. After heat treatment,
the mechanical properties of the product are more perfect, reaching a compressive strength
of up to 1100-1300 MPa (160-190 ksi). This grade cannot be used at temperatures above
300 ℃ (570F) or very low temperatures. It has good corrosion resistance to the atmosphere
and diluted acids or salts, and its corrosion resistance is the same as 304 and 430.
mechanical property
Tensile strength σ b (MPa): Aged at 480 ℃, ≥ 1310; 550 ℃ aging, ≥ 1060; 580 ℃ aging, ≥ 1000;
620 ℃ aging, ≥ 930
Conditional yield strength σ 0.2 (MPa): aging at 480 ℃, ≥ 1180; 550 ℃ aging, ≥ 1000; 580 ℃ aging,
≥ 865; 620 ℃ aging, ≥ 725
Elongation rate δ 5 (%): aging at 480 ℃, ≥ 10; 550 ℃ aging, ≥ 12; 580 ℃ aging, ≥ 13; 620 ℃ aging, ≥ 16
Shrinkage rate of cross-section (%): Aged at 480 ℃, ≥ 40; 550 ℃ aging, ≥ 45; 580 ℃ aging, ≥ 45; 620 ℃ aging, ≥ 50
Hardness: Solid solution, ≤ 363HB and ≤ 38HRC; 480 ℃ aging, ≥ 375HB and ≥ 40HRC; 550 ℃ aging, ≥ 331HB and ≥ 35HRC; 580 ℃ aging, ≥ 302HB and ≥ 31HRC; 620 ℃ aging, ≥ 277HB and ≥ 28HRC
Heat treatment process
Heat treatment specifications:
(1) Quick cooling at 1020-1060 ℃ for solid solution;
(2) Aging at 480 ℃, after solid solution treatment, air-cooled at 470-490 ℃;
(3) Aging at 550 ℃, after solid solution treatment, air-cooled at 540-560 ℃;
(4) Aging at 580 ℃, after solid solution treatment, air-cooled at 570-590 ℃;
(5) Aging at 620 ℃, after solid solution treatment, air-cooled at 610-630 ℃. Metallographic structure: characterized by precipitation hardening.
Size : diameter upto 600mm , length upto 8000mm
Delivery condition :
Forging + black
Forging + peeled surface
Forging + solution + peeled surface
Forging + solution + aging + peeled surface