Difference Between 1.4305 And 1.4301 SS

When selecting stainless steel for machining or corrosion resistance, 1.4305 (AISI 303) and 1.4301 (AISI 304) are often compared. While they may appear similar at first glance, these two austenitic stainless steels serve different purposes due to differences in sulfur content, machinability, weldability, and corrosion resistance.

In this guide, we explore the key differences, address frequently asked questions like "Can I weld 1.4305?" or "Which is better for CNC machining?", and help you choose the right material for your project.

 

What is 1.4301 equivalent to stainless steel ?

1.4301 stainless steel is equivalent to AISI 304 (often simply referred to as 304 or 18/8 stainless steel), also known as X5CrNi18-10 (EN standard) or SUS304 (Japanese standard). It is a widely used austenitic stainless steel that is non-magnetic and widely used due to its excellent corrosion resistance and formability.

 

 

What material is 1.4305 equivalent to stainless steel?

Material 1.4305 (X8CrNiS18-9) is primarily equivalent to AISI 303 stainless steel. It is a free-machining, austenitic stainless steel known for excellent machinability due to higher sulfur content. Other equivalent designations include UNS S30300, BS 303S31, and EN 58M.

 

1.4305 vs 1.4301 stainless steel：Chemical Composition

The higher sulfur content in 1.4305 enhances chip breaking and tool life during machining, but slightly reduces corrosion resistance compared to 1.4301.

Element	1.4301 (AISI 304)	1.4305 (AISI 303)
Carbon (C)	≤ 0.07 %	≤ 0.10 %
Chromium (Cr)	17.5 – 19.5 %	17 – 19 %
Nickel (Ni)	8 – 10.5 %	8 – 10 %
Manganese (Mn)	≤ 2.0 %	≤ 2.0 %
Sulfur (S)	≤ 0.015 %	0.15 – 0.35 % (higher)
Silicon (Si)	≤ 1.0 %	≤ 1.0 %

 

1.4305 vs 1.4301 stainless steel：Mechanical & Physical Properties

Property	1.4301 (304)	1.4305 (303)
Density	8.0 g/cm³	8.0 g/cm³
Tensile Strength (Annealed)	500 – 700 MPa	520 – 750 MPa
Yield Strength	≥ 210 MPa	≥ 230 MPa
Elongation (A5 %)	≥ 45 %	≥ 40 %
Hardness (HB)	≤ 215	≤ 230
Max. Service Temp.	870 °C	760 °C

 

1.4305 Vs 1.4301 Stainless Steel: Corrosion Resistance

1.4301 stainless steel has superior corrosion resistance compared to 1.4305, primarily because the latter contains sulfur for improved machinability. The sulfur in 1.4305 compromises its resistance to corrosive environments, especially those containing acids and chlorides, where it is prone to pitting. Both grades perform well in mild, conventional environments, but 1.4301 is the better choice when corrosion resistance is the priority.

 

1.4305 Vs 1.4301 Stainless Steel: Machinability

1.4305 (AISI 303) stainless steel is significantly more machinable than 1.4301 (AISI 304) because it contains added sulfur, which creates short, easily-broken chips during cutting. This makes 1.4305 the preferred choice for high-precision machining operations. In contrast, 1.4301 is less easy to machine, but offers superior corrosion resistance and better weldability.

 

Is 1.4301 magnetic?
No, both grades are essentially non-magnetic in the annealed condition, though slight magnetism can appear after cold working.

 

1.4301 stainless steel round pipe Price Range (Indicative)

Product Type	Grade	Estimated Price (USD/kg)	Remarks
Round Bar	1.4305	2.8 – 3.5 USD/kg	Machined finish, cut-to-length
Sheet / Plate	1.4301	2.6 – 3.2 USD/kg	2B or BA surface finish
Tube / Pipe	1.4301	3.0 – 4.0 USD/kg	Seamless or welded, polished

Prices vary by wall thickness, finish, certification, and order quantity.

 

Whether you need superior machinability or long-term corrosion resistance, understanding the difference between 1.4305 and 1.4301 can save you time, cost, and rework.Looking for expert sourcing or custom stainless steel solutions? Contact us today for technical advice, material certificates, and competitive pricing!

 

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