SUS347 vs SUS316: Corrosion Resistance, Strength and Applications
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When choosing stainless steel materials, it is crucial to understand the corrosion resistance, strength, and application areas of different steel grades. SUS347 and SUS316 are two common austenitic stainless steels, which have significant differences in chemical composition, corrosion resistance, high-temperature performance, and application scenarios.
What is SUS316 material?
SUS316 is a widely used austenitic stainless steel that conforms to Japanese Industrial Standards (JIS). Due to the addition of molybdenum, it possesses excellent corrosion resistance, making it ideal for harsh environments such as marine, chemical, food processing, and medical applications. Its resistance to chlorides and acids is superior to common stainless steel grades like 304. It is essentially identical to AISI 316 and exhibits excellent durability, weldability, and strength even under extreme conditions.
What is the equivalent of SUS347 stainless steel?
SUS 347 stainless steel equivalent is that of UNS CODE S34700, ASTM 347, KS STS 347, JIS SUS 347 and DIN 1.4550. The Modulus of Elasticity of AISI 347 stainless steel is 28.0 x 106 psi (193 GPa). The Melting Range of AISI 347 stainless steel is 1398–1446 °C (2550–2635 °F).
316 vs 347 Stainless Steel: Equivalents
| Grade | 316 | 347 |
|---|---|---|
| EN | 1.4401 / 1.4404 | 1.4550 |
| JIS | SUS316 | SUS347 |
| GB / China | 0Cr17Ni12Mo2 | 0Cr18Ni9Nb |
| UNS | S31600 / S31603 | S34700 |
316 vs 347 Stainless Steel:Chemical Composition
| Element | 316 | 347 |
|---|---|---|
| Cr | 16.0–18.0% | 17.0–19.0% |
| Ni | 10.0–14.0% | 9.0–13.0% |
| Mo | 2.0–3.0% | -- |
| Nb/Ta | -- | ≥ 10 × (C+N)%(Min),0.6–1.0% |
| C | ≤ 0.08% | ≤ 0.10%(347H)/0.08% |
| Mn | ≤ 2.0% | ≤ 2.0% |
| Si | ≤ 1.0% | ≤ 0.75% |
| P | ≤ 0.045% | ≤ 0.045% |
| S | ≤ 0.03% | ≤ 0.03% |
SUS316 and SUS347: Corrosion Resistance
SUS316 (JIS standard, equivalent to ASTM 316) has a pitting resistance equivalent number (PREN) of approximately 24–26, making it highly resistant to chloride-induced pitting and general corrosion in weak acid and seawater environments.
SUS347 stainless steel has a PREN of approximately 23–25, and its corrosion resistance in chloride-containing media is slightly lower than that of SUS316. However, SUS347 exhibits excellent intergranular corrosion resistance after exposure to temperatures of 427–816 °C because niobium prevents chromium carbide precipitation, thus maintaining a high local chromium content at the grain boundaries.
316 vs 347 Stainless Steel:Mechanical Properties
| Property | SUS347 Stainless Steel | SUS316 Stainless Steel |
|---|---|---|
| Tensile Strength (MPa) | 515–750 | 515–750 |
| Yield Strength (MPa) | ≥ 205 | ≥ 205 |
| Elongation (%) | ≥ 40 | ≥ 40 |
| Hardness | ≤ 95 HRB | ≤ 95 HRB |
| Density (g/cm³) | 8.0 | 8.0 |
316 vs 347 Stainless Steel: Applications
SUS347 Applications:
High-temperature environments: Furnace components, heat exchangers, and incinerators.
Chemical processing: Equipment exposed to high temperatures and oxidation, such as reforming reactors and catalytic converters.
Aerospace: Used in parts exposed to extreme temperatures and corrosive gases.
SUS316 Applications:
Marine environments: Shipbuilding, offshore oil platforms, and seawater desalination plants.
Chemical industry: Piping, tanks, and reactors for processing chemicals, including chlorides and acids.
What is the price difference between SUS347 and SUS316?
The price of SUS347 and SUS316 stainless steel is affected by factors such as thickness, surface treatment, market demand, and fluctuations in the prices of raw materials like nickel and chromium. The following are the approximate price ranges for SUS347 and SUS316:
| Material | Thickness | Price per Meter | Price per Ton |
|---|---|---|---|
| SUS347 | 1.0mm | $60 – $75 | $3,200 – $3,600 |
| SUS347 | 3.0mm | $120 – $150 | $3,400 – $3,800 |
| SUS316 | 1.0mm | $55 – $70 | $3,000 – $3,500 |
| SUS316 | 3.0mm | $110 – $140 | $3,200 – $3,600 |
Why Choose Gnee for SUS347 and SUS316 Stainless Steel?
Gnee provides high-quality SUS347 and SUS316 stainless steel products and offers the following advantages to our customers:
✔ 18+ years of manufacturing and export experience, providing stable global supply
✔ Compliant with international standards such as ASTM, AISI, EN, and JIS
✔ Fast delivery in 7-15 days, with customized sizes and surface treatments available upon request
✔ ISO, SGS, BV, and other certifications to ensure product quality and reliability
✔ Transparent pricing and free samples provided, giving you complete peace of mind before purchase
Whether you need high-temperature resistant SUS347 stainless steel pipes or high corrosion-resistant SUS316 stainless steel pipes, Gnee can provide the highest quality products and services to help you reduce procurement costs and ensure the smooth implementation of your projects.
