Sus 630 is a martensitic precipitation hardening stainless steel. It has high strength, high hardness, good welding performance and corrosion resistance. It is widely used in valve, shaft and chemical fiber industry, as well as high-strength parts with certain corrosion resistance requirements.

abstract

Sus 630 stainless steel (Japanese brand)

Stainless steel: sus 630

characteristic

Add copper precipitation hardening steel. Used to make shafts and turbine parts.

The precipitation hardening maraging stainless steel composed of copper, niobium / coltan has low carbon content, better corrosion resistance and weldability than general Markov stainless steel, similar to 18-8 stainless steel, simple heat treatment process and good cutting performance, but it is difficult to meet the requirements of low temperature processing.

Metallographic structure: the microstructure is characterized by precipitation hardening.

Use

It is used to manufacture parts with high corrosion resistance and high strength, such as bearings and turbine components.

Physical property

chemical composition

Carbon C: ≤ 0.07

Silicon silicon: ≤ 1.00

Manganese: ≤ 1.00

Sulfur s: ≤ 0.030

P ≤ 0.035

Chromium: 15.50 ~ 17.50

Nickel: 3.00 ~ 5.00

Copper and copper

NB NB: 0.15 ≤ 0.45

Delivery condition

Generally, the goods shall be delivered in heat treatment state, and the type of heat treatment shall be indicated in the contract; if not, the goods shall be delivered in non heat treatment state.

The alloy is a precipitation, quenching, maraging stainless steel with high strength, high hardness and corrosion resistance. After heat treatment, the mechanical properties of the product are good, and the compressive strength can reach 1100-1300 MPa (160-190 Ksi). This grade is not suitable for above 300 ℃ (570f) or very low temperature. It has good atmospheric corrosion resistance and dilute acid salt corrosion resistance, and its corrosion resistance is equivalent to 304 and 430.

mechanical property

Tensile strength σ B (MPA):

Age 480 ℃, ≥ 1310;

Age: 550 ℃, ≥ 1060;

Age: 580 ℃, ≥ 1000;

Age 620 ℃, ≥ 930

Conditional yield strength σ 0.2 (MPA):

Age 480 ℃, ≥ 1180;

Aging to 550 ℃, ≥ 1000;

The age was 580 ℃, ≥ 865;

Age 620 ℃, ≥ 725

Extension δ 5 (%): aging at 480 ℃, aging at ≥ 10 ≤ 550 ℃, aging at ≥ 12 ≤ 580 ℃, aging at ≥ 13 ≤ 620 ℃, aging at ≥ 16

Section shrinkage (%):

Age: 480 ℃, ≥ 40;

Age: 550 ℃, ≥ 45;

The age was 580 ℃, ≥ 45;

Age at 620 ℃, ≥ 50

Hardness: solid solution, ≤ 363 Hb and ≤ 38 HRC;

Age at 480 ℃, ≥ 375 Hb and ≥ 40 HRC;

Age: 550 ℃, ≥ 331hb and ≥ 35 HRC;

Age at 580 ℃, ≥ 302 Hb and ≥ 31 HRC;

Aging at 620 C, ≥ 277 Hb and ≥ 28 HRC

Heat treatment process

Heat treatment specification:

1) Fast cooling of solid solution at 1020 × 1060 ℃;

2) After solution treatment, it aged at 480 ℃ and air cooled at 490 ℃;

3) After solution treatment, it aged at 5500 ℃ and air cooled at 540 ℃;

4) After solution treatment, it aged at 580 ℃ and air cooled at 570 ℃;

5) Aging at 60 ℃, air cooling at 610 ℃ and 630 ℃ after solution treatment.

Metallographic structure: the microstructure is characterized by precipitation hardening.