304 vs 316 stainless steel pipe

what is 304 Stainless steel Pipe specifications?

304 stainless steel pipe is a widely used, corrosion-resistant austenitic stainless steel pipe containing approximately 18% chromium and 8% nickel; it is available in both seamless and welded forms. Common standards include ASTM A312 (welded/seamless) and A213 (boiler/heat exchanger), with wall thickness schedules ranging from 5S to 160. Key specifications include: a tensile strength of approximately 73,200 psi (505 MPa), a yield strength of approximately 31,200 psi (215 MPa), and a melting point of 1450°C.

 

what is 316 stainless steel pipe specifications?

316/316L stainless steel pipes are austenitic, molybdenum-bearing alloys offering superior corrosion resistance, particularly against chloride-induced pitting. They meet ASTM A312/A269 standards, available in seamless or welded forms, with sizes from 1/8 to 30 inches NPS, schedules 10S-80S, and tensile strengths over 485–515 MPa.

 

What is the difference between 304 and 316 stainless steel pipe?

The fundamental differences between 304 and 316 stainless steel pipes lie in their composition, corrosion resistance, and price. Building upon the 304 base, the 316 grade incorporates molybdenum (2–3%) and features an increased nickel content; this renders it more resistant to chlorides (such as saltwater and marine environments) as well as chemical corrosion. Consequently, it offers superior performance compared to 304-albeit at a higher cost-making it suitable for applications in the chemical, medical, and coastal sectors, whereas 304 is well-suited for most everyday food-related and general civil engineering applications.

 

304 vs. 316 Stainless Steel Pipe: Chemical Composition

Element	304 (UNS S30400)	316 (UNS S31600)
Chromium (Cr)	18.0 – 20.0	16.0 – 18.0
Nickel (Ni)	8.0 – 10.5	10.0 – 14.0
Molybdenum (Mo)	-	2.0 – 3.0
Carbon (C)	0.08 max	0.08 max
Manganese (Mn)	2.00 max	2.00 max
Silicon (Si)	1.00 max	1.00 max
Phosphorus (P)	0.045 max	0.045 max
Sulfur (S)	0.030 max	0.030 max
Nitrogen (N)	0.10 max	0.10 max
PREN Value*	~18.0 – 20.0	~23.0 – 28.5

 

304 vs. 316 Stainless Steel Pipe: Mechanical Properties

Property	304 Stainless Steel	316 Stainless Steel
Tensile Strength, min.	515 MPa (75 ksi)	515 MPa (75 ksi)
Yield Strength (0.2% Offset), min.	205 MPa (30 ksi)	205 MPa (30 ksi)
Elongation (in 2 in. or 50mm), min.	35% – 40%	35% – 40%
Hardness (Brinell), max.	192 HBW	192 HBW
Hardness (Rockwell B), max.	90 HRB	90 HRB
Density	8.00 g/cm³	8.00 g/cm³
Modulus of Elasticity	193 GPa	193 GPa

 

304 vs. 316 Stainless Steel: Corrosion Resistance

304 stainless steel tubing is highly suitable for general-purpose applications, food processing, and residential environments. However, when exposed to seawater, salt spray, or de-icing chemicals, it is susceptible to pitting corrosion. 316 stainless steel round tubing contains a 2–3% molybdenum content, which forms a more robust passive film, thereby effectively resisting pitting and crevice corrosion induced by chloride ions.

 

304 vs. 316 Stainless Steel: Temperature

Both 316 and 304 stainless steel tubing exhibit excellent oxidation resistance at temperatures up to 870°C (1600°F). In high-temperature environments (above 500°C), the 316 grade typically demonstrates slightly superior creep strength compared to the 304 grade, thanks to the presence of molybdenum.

 

304 vs 316 stainless steel：machinability

304 stainless steel is generally easier to machine than 316, boasting a machinability rating of roughly 40-45% compared to 316's 35-40%. While both are considered difficult to machine due to high work-hardening rates, 316 is "gummier," wears tools faster, and requires lower cutting speeds and higher coolant pressure to prevent work hardening.

 

Stainless Steel 304 vs. 316: Price

Initial Cost: The price of 316 is typically 30% to 50% higher than that of 304; this difference is primarily attributed to the cost of the nickel and molybdenum elements. In corrosive environments, 304 may fail within just 1–2 years, whereas 316 can remain in service for decades.

 

304 & 316 Stainless Steel Pipe Supplier

If you have project-specific requirements for 304 and 316 stainless steel pipes, we welcome your orders. GNEE maintains a substantial inventory of best-selling products for you to choose from. Available in both seamless and welded forms, our products can be customized to your specifications. For detailed chemical composition data or to request free samples, please contact our factory immediately. We offer competitive pricing and exceptional service.

Our products are packaged using waterproof paper and steel strapping, adhering to standard export packaging requirements for sea freight. This packaging is suitable for various modes of transport and can also be customized according to specific client requests.
Packaging
Standard Export Packaging for Stainless Steel Plates
1. Polished surface finish; 2. Bundled packaging;
3. Wooden crate packaging; Wooden pallet packaging;
4. Containerized or bulk cargo shipping; 5. Customized according to client requirements.