SUS630 bolt/s17400 bolt/s51740 bolt/05Cr17Ni4Cu4Nb bolt (nut) is a martensitic precipitation hardening stainless steel, with the Chinese grade 05Cr17Ni4Cu4Nb. Has high strength, high hardness, good welding performance, and corrosion resistance. It has been widely promoted and applied in the valve, shaft, and chemical fiber industries, as well as high-strength components with certain corrosion resistance requirements.
SUS630 stainless steel (Japanese grade) 05Cr17Ni4Cu4Nb (Chinese grade) stainless steel: SUS630 characteristic precipitation hardening steel grade with added copper. Used for manufacturing shaft and turbine components. Precipitation hardened martensitic stainless steel composed of copper, niobium/niobium has a low carbon content, better corrosion resistance and weldability than general martensitic stainless steel. Similar to 18-8 stainless steel, it has a simple heat treatment process and good machinability, but it is difficult to meet the requirements of deep cold processing. Metallographic structure: characterized by precipitation hardening. Used for manufacturing components with high corrosion resistance and strength, such as bearings and turbine parts.
purpose
Used for manufacturing components with high corrosion resistance and strength, such as bearings and turbine parts.
Physical properties
chemical composition
Carbon C: ≤ 0.07
Silicon Si: ≤ 1.00
Manganese Mn: ≤ 1.00
Sulfur S: ≤ 0.030
Phosphorus P: ≤ 0.035
Chromium Cr: 15.50-17.50
Nickel Ni: 3.00-5.00
Copper Cu: 3.00-5.00
Niobium Nb: 0.15~0.45
mechanical properties
Tensile strength σ b (MPa):
480 ℃ aging, ≥ 1310;
550 ℃ aging, ≥ 1060;
580 ℃ aging, ≥ 1000;
620 ℃ aging, ≥ 930
Conditional yield strength σ 0.2 (MPa):
480 ℃ aging, ≥ 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 (%):
480 ℃ aging, ≥ 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 ℃.
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