SUS630 is one kind of martensitic precipitate hardened stainless steel, Chinese brand 0Cr17Ni4Cu4Nb.  With high strength, high hardness, good welding performance and corrosion resistance.  It has been widely used in valve, shaft and chemical fiber[TJC STEEL] industry and high strength parts with certain corrosion resistance requirements. SUS630 is named in JIS standard, and in Chinese standard it is named 0Cr17Ni4Cu4Nb, in ASTM this material is named S17400 and in EN standard it is named X5CrNiCuNb16-4.    

 

Features for SUS630 Stainless:  

Precipitate hardened section steel with added copper.  Used for manufacturing shaft and steam turbine parts.  

Precipitated-hardened martensitic stainless steel composed of copper, niobium/columbium has low carbon content, better corrosion resistance and weldability than ordinary Martensitic stainless steel, similar to 18-8 stainless steel,[TJC STEEL] simple heat treatment process, good machinability, but difficult to meet cryogenic processing.  

Metallographic structure: the structure features are precipitate hardening type.  

 

Application for SUS630 Stainless:  

SUS630 Stainless is mainly used for manufacturing parts with high corrosion resistance and high strength, such as bearings and [TJC STEEL]steam turbine parts, offshore platforms, helicopter decks, other platforms food industry pulp and paper industry Aerospace (turbine blades) machinery parts nuclear waste drums, etc.  

 

 

Chemical Composition for SUS630 Stainless(%):  

Carbon C: 0.07 or less  

Si Si: 1.00 or less  

Manganese Mn: 1.00 or less  

S: sulfur 0.030 or less  

P P: 0.035 or less  

Chromium Cr: 15.50 ~ 17.50  

Nickel Ni: [TJC STEEL]3.00 ~ 5.00  

Cu: 3.00 ~ 5.00 Niobium Nb: 0.15 ~ 0.45  

 

Delivery Condition for SUS630 Stainless:  

Generally, the goods are delivered in the condition of heat treatment, and the type of heat treatment is indicated [TJC STEEL]in the contract.  If it is not indicated, the goods will be delivered without heat treatment.  

SUS630 alloy is precipitated, quenched, martensitic stainless steel, and this grade has properties such as high strength, hardness and corrosion resistance.  After heat treatment, the mechanical properties of the product are more perfect, and the compressive strength can reach up to 1100-1300 mpa [TJC STEEL](160-190 kSi).  This grade is not intended for use above 300℃ (570F) or very low temperatures. It has good corrosion resistance to atmospheric and diluted acids or salts, as is the case with 304 and 430.  

 

Mechanical Properties: 

Tensile strength σ B (MPa) : aged at 480℃,≥1310;  550 ℃ ageing, p 1060;  580 ℃ ageing, p 1000;  620 ℃ ageing, p. 930  

Condition yield strength σ0.2 (MPa) : aged at 480℃,≥1180;  550 ℃ ageing, p 1000;  580 ℃ ageing, p 865;  [TJC STEEL]620 ℃ ageing, p. 725  

Elongation δ5 (%) : aged at 480℃,≥10;  550 ℃ ageing, 12 or higher;  580 ℃ ageing, 13 or higher;  620 ℃ ageing, 16 or higher  

ψ (%) : aging at 480℃,≥40;  550 ℃ ageing, 45 or higher;  580 ℃ ageing, 45 or higher;  620 ℃ ageing, 50 or more  

Hardness: solution,≤363HB and ≤38HRC;  Aged at 480℃,≥375HB and ≥40HRC;  Aged at 550℃,≥331HB and ≥35HRC;  [TJC STEEL]Aged at 580℃,≥302HB and ≥31HRC;  Aging at 620℃,≥277HB and ≥28HRC  

 

Heat Treatment Specification:  

1) Fast cooling at 1020 ~ 1060℃ for solution;  

2) Aged at 480℃, air cooled at 470 ~ 490℃ after solution treatment;  

3) Aged at 550℃, [TJC STEEL]air cooled at 540-560 ℃ after solution treatment;  

4) Aged at 580℃, air cooled at 570 ~ 590℃ after solution treatment;  

5) Aging at 620℃, after solution treatment, air cooling at 610 ~ 630℃.  Metallographic structure: the structure features are precipitate hardening type.