1.4310 vs. 1.4305 stainless steel: composition

When choosing the right stainless steel for your project, understanding the differences in chemical composition between grades is essential.
1.4310 (often referred to as AISI 301) and 1.4305 (AISI 303) are both popular grades of austenitic stainless steel, but they have distinct compositions and properties that make them suitable for different applications.
In this article, we compare the chemical composition and properties of 1.4310 and 1.4305, helping you determine which grade is best for your needs.

 

What is 1.4310 material?
1.4310 is a European (EN) designation for a stainless steel, commonly known as AISI 301 or 302. It's an austenitic stainless steel known for its high strength, good corrosion resistance, and ability to be strengthened through cold working. This material is often used in applications requiring spring properties and is also suitable for welding.

 

What is stainless steel 1.4305?
Stainless steel type 1.4305 is popularly known as grade 303 stainless steel. Grade 303 is the most readily machineable of all the austenitic grades of stainless steel. The machineable nature of grade 303 is due to the presence of Sulphur in the steel composition.

 

Key Differences in Composition

Element	1.4310 (AISI 301)	1.4305 (AISI 303)
Carbon (C)	0.12 – 0.15%	0.15% max
Chromium (Cr)	16.0 – 18.0%	16.0 – 18.0%
Nickel (Ni)	6.0 – 8.0%	9.0 – 11.0%
Manganese (Mn)	2.0 – 3.0%	2.0 – 3.0%
Silicon (Si)	0.75% max	0.75% max
Phosphorus (P)	0.045% max	0.045% max
Sulfur (S)	0.30% max	0.30% max

 

​​Corrosion Resistance​​

Both 1.4310 and 1.4305 are austenitic stainless steels with comparable basic corrosion resistance (e.g., in atmospheric, freshwater, and weak acidic environments). However, 1.4305, with its higher nickel content, exhibits slightly better pitting/crevice corrosion resistance in chloride-containing (e.g., seawater) or weakly acidic environments. 1.4310, due to its slightly higher carbon content, requires attention to the risk of sensitization caused by carbide precipitation during long-term use at high temperatures (e.g., 400-800°C); solution treatment is necessary after welding.

 

Mechanical Properties of 1.4310 vs. 1.4305 Stainless Steel

Property	1.4310 (AISI 301)	1.4305 (AISI 303)
Tensile Strength (MPa)	650 – 1100	500 – 750
Yield Strength (MPa)	≥ 310	≥ 205
Elongation (%)	≥ 40	≥ 40
Hardness (HB)	200 – 250	200 – 240
Modulus of Elasticity (GPa)	190 – 200	190 – 200
Poisson's Ratio	0.29	0.29
Density (g/cm³)	8.0	8.0
Thermal Conductivity (W/m·K)	16.2	16.2

 

Strength​​

1.4310 stainless steel has a lower nickel content and slightly higher carbon, resulting in a higher cold working hardening rate. It is suitable for applications requiring high strength achieved through cold working hardening (e.g., springs, fasteners); its elongation is slightly lower than that of 1.4305.

1.4305 stainless steel features a higher nickel content and lower carbon, leading to a gentler cold working hardening rate and easier formability; its strength is slightly lower than 1.4310, but it offers better toughness (more stable impact resistance), making it ideal for tableware, kitchen utensils, architectural decorative parts, and chemical pipelines.

 

1.Can 1.4305 stainless steel be welded?
Yes, both 1.4310 and 1.4305 can be welded, but 1.4310 may require post-weld heat treatment to restore its strength and prevent cracking.

 

2.Which stainless steel is more suitable for food processing equipment?
Both grades are suitable for food processing equipment, but 1.4305 is often chosen for machined parts due to its excellent machinability.

 

3.Which grade should I choose for springs?
1.4310 is the preferred grade for springs because its higher carbon content increases the material's strength and elasticity.

 

If you have a project need for 301 1.4310 stainless steel bar, we welcome your order. GNEE has a large inventory of popular products for you to choose from. We process these bars into a variety of practical product forms, including sheet, coil, tube, bar, and wire. For detailed chemical composition and free samples, please contact our factory today. We offer competitive pricing and excellent service.Email: info@gneestainless.com