Overview
631 stainless steel, also known as 17-7 PH stainless steel, is a
versatile corrosion-resistant alloy with a unique chemical
composition. The main components are iron, chromium and nickel, but
also contain small amounts of aluminum and copper. 631 stainless
steel is unique in its unique precipitation hardening ability
achieved through heat treatment. This stainless steel alloy is
widely used in various industries, including aerospace, automotive
and medical. Its superior strength combined with good formability
makes it suitable for the manufacture of complex components such as
springs, washers and high-strength structural parts. In addition,
its corrosion resistance and biocompatibility make it an excellent
choice for surgical instruments, orthodontic devices, and
implantable medical devices. With its combination of mechanical
properties and resistance to environmental factors, 631 stainless
steel remains a popular material in a variety of demanding
applications.
Chemical composition
| C | Mn | Si | P | S | Cr | Ni | Al |
| 0.09 | 1 | 0.5 | 0.025 | 0.025 | 16.00 – 17.25 | 6.50 – 7.75 | 0.75 – 1.25 |
Mechanical Properties
| AISI 63 |
Ultimate Tensile
Strength | 1170Mpa,170000psi |
| Yield Strength | 965Mpa,140000ps |
| Elongation % | 6 min |
Physical properties
Tensile strength σb (MPa) : solid solution,≤1030; Aging at 565℃,≥1140; Aging at 510℃ ≥1230
Conditional yield strength σ0.2 (MPa) : solid solution,≤380; Aging at 565℃,≥960; Aging at 510℃ ≥1030
Elongation δ5 (%) : solid solution,≥20; Aging at 565℃,≥5; Aging at 510℃ ≥4
Section shrinkage ratio ψ (%) : 565℃ aging,≥25; Aging at 510℃,≥10
Hardness: solid solution,≤229HB; Aging at 565℃,≥363HB; Aging at 510℃,≥388HB
Heat treatment
1.Solid solution,1000 ~ 1100℃ fast cooling;
2. Aged at 565℃, after solution treatment, 760±15℃ for 90min,
cooled to below 15℃ within 1h, kept for 30min, then heated to
565±10℃ for 90min, air cooling;
3. 510℃ aging, after solid solution treatment,955±10℃ for 10min,
air cooling to room temperature within 24h cooling to -73±6℃,
maintained for 8h, then heated to 510±10℃ for 60min, air cooling.
Corrosion Resistance
The 631 stainless steel is highly corrosion-resistant in seawater,
acids, and alkalis environments. It offers better corrosion
resistance than 304 and 316 stainless steel due to its higher
chromium content. However, the alloy is susceptible to pitting and
crevice corrosion in chloride-containing solutions.
Why choose us
1.Size control
2.Chemical composition control
4.ultrasonic testing of steel tube
3.hydraulic testing machine
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