SUS630、S17400、Z7CNU15-05、Z67CNU17.04、 Z7CNU17.04

SUS630 (S17400, 0cr17ni4cu4nb, SCS24) precipitation hardening steel overview:

SUS630 stainless steel is a precipitation, hardened, martensitic stainless steel composed of copper, niobium / rhenium. In the environment up to 539 ° C, SUS630 still shows good anti-oxidation performance. Precipitation-hardened stainless steels exhibit reduced toughness if exposed to elevated temperatures for extended periods of time. Sometimes higher aging temperatures can minimize toughness reduction. If the maximum temperature is at least 28 ° C lower than the aging temperature, short-term exposure to high temperatures is feasible. The corrosion resistance of SUS630 is better than that of 400 series stainless steel. For most corrosive substances, the resistance of SUS630 is close to 302 and 304 stainless steel. Through 552 ° C or higher hardening treatment can provide good resistance to stress corrosion cracking. Because the material has good corrosion resistance and high hardness, SUS630 can also withstand wear and corrosion. In order to ensure the best corrosion resistance, the surface of the material should be completely removed from debris, lubricants, foreign materials, coatings used for drawing or forging. After the parts are processed, they should be cleaned and passivated.

 

Chemical composition of SUS630 (S17400, 0cr17ni4cu4nb, SCS24) precipitation hardening steel:

C≤	Si≤	Mn≤	P≤	S≤	Ni	Cr	Cu	Nb+Ta
0.07	1.00	1.00	0.04	0.030	3.00  5.00	15.50 17.50	3.00  5.00	0.15  0.45

 

Mechanical properties of SUS630 (S17400, 0cr17ni4cu4nb, SCS24) precipitation hardening steel:

Tensile strength σb (MPa): aging at 480 ℃, ≥1310; aging at 550 ℃, ≥1060; aging at 580 ℃, ≥1000; aging at 620 ℃, ≥930

Conditional yield strength σ0.2 (MPa): aging at 480 ° C, ≥1180; aging at 550 ° C, ≥1000; aging at 580 ° C, ≥865; aging at 620 ° C, ≥725

Elongation δ5 (%): aging at 480 ℃, ≥10; aging at 550 ℃, ≥12; aging at 580 ℃, ≥13; aging at 620 ℃, ≥16

Section shrinkage ψ (%): aging at 480 ℃, ≥40; aging at 550 ℃, ≥45; aging at 580 ℃, ≥45; aging at 620 ℃, ≥50

Hardness: solid solution ≤363HB and ≤38HRC; aging at 480 ℃, ≥375HB and ≥40HRC; aging at 550 ℃, ≥331HB and ≥35HRC; aging at 580 ℃, ≥302HB and ≥31HRC; aging at 620 ℃, ≥277HB and ≥28HRC

Density: 7.80g / cm3

 

SUS630 (S17400, 0cr17ni4cu4nb, SCS24) precipitation hardening steel applications:

Widely used in oil field valve parts, chemical processing equipment, aircraft joints, fasteners, pump shafts, nuclear reactor parts, gears, paper mill equipment, missile joints, jet engine parts, etc.

 

SUS630 (S17400, 0cr17ni4cu4nb, SCS24) heat treatment specification for precipitation hardening steel:

1) Solid cooling at 1020 ～ 1060 ℃

2) Aging at 480 ℃, after solution treatment, air cooling at 470 ～ 490 ℃

3) Aging at 550 ℃, after solution treatment, air cooling at 540 ～ 560 ℃

4) Ageing at 580 ℃, after solution treatment, air cooling at 570 ～ 590 ℃

5) Aging at 620 ℃, after solution treatment, air cooling at 610 ～ 630 ℃.