Difference Between SCS13 and SUS304 Stainless Steel

If you are looking for the difference between SCS13 and SUS304 stainless steel, you are likely sourcing austenitic stainless steels for casting or fabrication purposes. Although both grades are based on the same Cr-Ni (18-8) stainless system, there are important distinctions between them in manufacturing process, mechanical properties, and usage scenarios.

 

What is SCS13 stainless steel?

SCS13 stainless steel is a cast austenitic stainless steel grade equivalent to 304 stainless steel (SUS304), prized for its general corrosion resistance, strength, and machinability. It is widely used in industrial applications such as valves, pumps, and construction materials for its ability to handle corrosive environments like industrial and pure water, wastewater, and pulp.

What is SUS304 stainless steel?

SUS304 is an austenitic stainless steel that conforms to Japanese Industrial Standards (JIS). It has properties comparable to common ASTM 304 or 18-8 stainless steel and is widely used in kitchenware, food and beverage equipment, and other applications requiring a balance of strength, durability, and corrosion resistance.

 

Are SCS13 and SUS304 the same?

Not exactly the same. SCS13 is a cast version of SUS304. They have similar chemical compositions, but SCS13 is a cast structure, while SUS304 is a forged (rolled) structure.

 

Difference Between SCS13 and SUS304 Stainless Steel

Grade	Standard	Type	Form	Applications
SCS13	JIS G5121	Austenitic Stainless Steel (Cast)	Castings, valve bodies, pump housings	Chemical, marine, and pressure equipment
SUS304	JIS G4303 / G4304	Austenitic Stainless Steel (Wrought)	Plate, Sheet, Bar, Pipe	Food processing, construction, piping, machinery

In simple terms: SCS13 is the cast equivalent of SUS304. They share a similar composition but differ in structure and performance due to different forming processes (casting vs. forging/rolling).

 

SCS13 vs SUS304  stainless steel :Chemical Composition

Element	SCS13 (JIS G5121)	SUS304 (JIS G4303)
C (Carbon)	≤ 0.08%	≤ 0.08%
Si (Silicon)	≤ 1.00%	≤ 1.00%
Mn (Manganese)	≤ 1.50%	≤ 2.00%
P (Phosphorus)	≤ 0.040%	≤ 0.045%
S (Sulfur)	≤ 0.030%	≤ 0.030%
Cr (Chromium)	18.0 – 20.0%	18.0 – 20.0%
Ni (Nickel)	8.0 – 11.0%	8.0 – 10.5%

 

SCS13 vs SUS304 stainless steel :Mechanical Properties 

Property	SCS13	SUS304
Tensile Strength (MPa)	≥ 440	≥ 520
Yield Strength (MPa)	≥ 205	≥ 215
Elongation (%)	≥ 25	≥ 40
Hardness (HB)	≤ 187	≤ 180

 

Corrosion Resistance and Heat Resistance

Corrosion Resistance:
Both SCS13 and SUS304 have similar chromium and nickel content, providing excellent resistance to oxidation, acid, and alkali corrosion.
However, SCS13 may have more micro-porosity and inclusions due to casting, making surface finish and passivation more important.

Heat Resistance:
Both grades perform well up to 870°C (1600°F) in intermittent service.
For continuous service or higher temperatures, a stabilized version like SUS321 or SUS316Ti is recommended.

 

SCS13 vs SUS304 stainless steel :Applications

SCS13	SUS304
Pump and valve bodies	Tanks, pipes, and heat exchangers
Impellers and flanges	Food and beverage equipment
Chemical and marine castings	Architectural panels and kitchenware
High-temperature cast parts	Pressure vessels and tubing

 

Are SCS13 and SUS304 interchangeable?

Generally, they are interchangeable in terms of corrosion resistance. However, for applications requiring high formability, polishing, or welding, SUS304 is recommended.

 

Which is more suitable for pressure equipment?

SUS304 is commonly used for pressure vessels and storage tanks due to its higher ductility and uniform microstructure.

 

Why Choose Gnee for Stainless Steel Materials

✅ 18+ years of export experience

✅ Complete inventory of SUS304 sheets, plates, and pipes

✅ Custom casting and CNC machining for SCS13 components

✅ Certified to ASTM, JIS, EN, and ISO standards

✅ Competitive pricing with flexible payment terms

✅ Fast delivery (7–15 days) and seaworthy packaging

 

SUS304 stainless steel Rolled plate Specification

Attribute	Specification
Standard	JIS G4304 / ASTM A240
Grades Available	SUS304, 304L, 304H
Thickness Range	0.3 mm – 100 mm
Width Range	1000 mm – 2000 mm
Length Range	2000 mm – 6000 mm
Surface Finish	2B, BA, No.1, No.4, HL, Mirror
Delivery Condition	Annealed & Pickled
Certification	EN 10204 3.1 MTC / ISO / SGS / BV
HS Code	7219 / 7220 (for stainless plates and sheets