What is SUS630?

SUS630 is a martensitic precipitation hardening stainless steel with the Chinese brand 0Cr17Ni4Cu4Nb. It has high strength, high hardness, good welding performance and corrosion resistance. It has been widely used in valve, shaft and chemical fiber industries and high-strength parts with certain corrosion resistance requirements.

What is the chemical composition of SUS630?

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: 3.00~5.00

Copper Cu: 3.00~5.00

Nb: 0.15~0.45

What are the mechanical properties of SUS630?

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

Conditional yield strength σ 0.2 (MPa): aging at 480 ℃, ≥ 1180; Aging at 550 ℃, ≥ 1000; 580 ℃ aging, ≥ 865; Aging at 620 ℃, ≥ 725

Elongation δ 5 (%): aging at 480 ℃, ≥ 10; Aging at 550 ℃, ≥ 12; 580 ℃ aging, ≥ 13; Aging at 620 ℃, ≥ 16

Reduction of area ψ  (%): aging at 480 ℃, ≥ 40; Aging at 550 ℃, ≥ 45; 580 ℃ aging, ≥ 45; Aging at 620 ℃, ≥ 50

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

What is the heat treatment specification of SUS630?

1) Solid solution 1020~1060 ℃ fast cooling;

2) 480 ℃ aging, after solution treatment, 470~490 ℃ air cooling;

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

4) 580 ℃ aging, after solution treatment, 570~590 ℃ air cooling;

5) Aging at 620 ℃, after solution treatment, air cooling at 610-630 ℃. Metallographic structure: the structure is characterized by precipitation hardening.

What are the uses of SUS630 stainless steel?

1. SUS630 stainless steel plate is suitable for making plastic mold and rubber mold requiring high corrosion resistance and high wear resistance;

2. SUS630 stainless steel module is suitable for making plastic molds for semiconductor IC sealing and mold accessories requiring corrosion resistance and rust prevention;

3. SUS630 stainless steel round rod is applicable to turbine blades, nozzles, valves, plate rulers, high corrosion resistant bearing parts and high wear resistant equipment parts;

4. SUS630 stainless steel is applicable to the production of high corrosion resistant mold equipment such as food industry and offshore platforms.

Because of its excellent mechanical properties and corrosion resistance, SUS630 is also widely used in petrochemical, nuclear power, aerospace, shipbuilding, automobile, medical and other industries.

What are the advantages of SUS630 stainless steel?

SUS630 stainless steel is a chromium-nickel stainless steel which contains columbium – a rare element that enhances corrosion resistance in many media. In addition, SUS630 has good oxidation resistance and can be formed and welded easily. This makes it an ideal choice for highly stressed parts that require high strength and good corrosion resistance.

What are the disadvantages of SUS630 stainless steel?

There are several disadvantages to using SUS630 stainless steel in processing technology. One of the primary disadvantages is its high carbon content. This can result in carbide precipitation, which can lead to corrosion and reduced ductility. Additionally, the high carbon content can make SUS630 stainless steel difficult to weld. Another disadvantage to using this material is its susceptibility to intergranular corrosion, particularly when exposed to temperatures below 450°F. Finally, because of its high chromium and nickel content, SUS630 stainless steel is more expensive than other types of stainless steel.

What are the applications of SUS630 stainless steel?

SUS630 stainless steel is a chromium-nickel stainless steel with columbium added to help protect against intergranular corrosion. SUS630 is also stabilised by additions of niobium and tantalum. The columbium reduces carbide precipitation during welding and the niobium/tantalum combination helps control austenite formation thus providing improved resistance to intergranular corrosion especially in chloride environments.
This grade is suitable for a wide variety of applications including:
- Petrochemical equipment
- Heat exchangers
- Pipe work
- Boiler feedwater heaters
- Pressure vessels
- Rotating drums and media storage tanks

How to care for SUS630 Stainless Steel?

Stainless steel is a steel alloy with a minimum of 10.5% chromium content by mass. It is highly corrosion-resistant and can be used in a wide range of applications, from automotive to kitchenware. While it is easy to care for overall, there are a few things to keep in mind when cleaning and caring for SUS630 stainless steel specifically.
First, avoid using abrasive cleaners or scrubbers on the surface as they can damage the finish. Instead, opt for a mild detergent or soap and water solution. If there are stubborn stains, you can use a vinegar-based cleaner before rinsing thoroughly.
When drying, make sure to use a soft cloth in order to avoid scratches. If you need to remove heavy rust or debris, you can do so with a wire brush specifically designed for stainless steel (be careful not to damage the surface).
In general, it is best to avoid harsh chemicals and acidic solutions when cleaning any type of stainless steel. If you have any questions about what products are safe to use, feel free to contact the manufacturer or speak with a professional.