A240 Type 316N | UNS S31651 Stainless steel plate supplier
What is A240 Type 316N Stainless steel?
As a professional China steel mill-Direct Supply and stainless steel plate supplier, SHH STEEL is pleased to present A240 Type 316N | UNS S31651 Stainless Steel Plate.
This grade is widely known and searched under many different names and designations, including A240 Type 316N, ASME SA240 Type 316N, AISI 316N, UNS S31651, 316N stainless steel plate, 316N plate, SUS316N, 1.4406 related, and nitrogen-strengthened 316. All these names refer to the same molybdenum-bearing austenitic grade with intentional nitrogen addition.
A240 Type 316N contains approximately 16–18% chromium, 10–14% nickel and 2–3% molybdenum, with nitrogen typically controlled at 0.10–0.16%. Nitrogen increases yield and tensile strength through solid-solution strengthening, helps stabilize the austenitic structure, and supports good pitting resistance. Corrosion performance remains essentially in the 316 family, while annealed strength is clearly higher than standard a240 316 or a240 316l.
The grade is non-magnetic in the annealed condition and is selected for pressure vessels, tanks, structural fabrications and process equipment that need higher load-bearing capacity without changing to duplex stainless steels.
SHH STEEL supplies A240 Type 316N / UNS S31651 as true China steel mill-Direct Supply, sourcing directly from major Chinese stainless steel mills. This model delivers competitive mill pricing, consistent quality, complete heat traceability and reliable delivery. SHH STEEL offers 316N in plate and sheet form across a practical range of thicknesses and surface finishes.
A240 Type 316N is frequently compared with a240 316, a240 316l, a240 316n, a240 316ti, a240 317l and a240 2205. SHH STEEL provides technical support to help customers choose the most appropriate grade.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Grade | A240 Type 316N / UNS S31651 | Confirmed |
| Related Standards | ASTM A240, ASME SA240, related EN / JIS | Available |
| Product Form | Plate, Sheet | Available |
| Delivery Condition | Solution Annealed | Standard |
| Thickness Range | 0.5 mm – 80 mm (thicker available on request) | Custom sizes supported |
| Width | Up to 2000–3000 mm | Available |
| Length | Up to 12000 mm or cut-to-length | Available |
| Surface Finish | 2B, No.1, BA, No.4 | Available |
| Certification | EN 10204 3.1 / Mill Test Certificate | Available |
SHH STEEL can supply dual-certified ASTM A240 / ASME SA240 Type 316N material when required by the project.
Chemical Composition
Typical Chemical Composition of A240 Type 316N (UNS S31651):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Silicon (Si) | ≤ 0.75 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 16.00 – 18.00 |
| Nickel (Ni) | 10.00 – 14.00 |
| Molybdenum (Mo) | 2.00 – 3.00 |
| Nitrogen (N) | 0.10 – 0.16 |
| Iron (Fe) | Balance |
The intentional nitrogen addition (0.10–0.16%) is the key difference from standard Type 316. Nitrogen raises strength while molybdenum maintains better pitting and crevice corrosion resistance than the 304 family. SHH STEEL carefully controls nitrogen content to ensure consistent mechanical properties.
Mechanical Properties
Annealed Condition (typical ASTM A240 values)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 550 MPa (80 ksi) |
| Yield Strength (0.2%) | ≥ 240 MPa (35 ksi) |
| Elongation (in 50 mm) | ≥ 35% |
| Hardness | ≤ 217 HBW |
A240 Type 316N offers higher annealed strength than standard 316 and 316L, which can allow thickness reduction in many designs. Ductility remains good. SHH STEEL supplies material with consistent nitrogen-enhanced mechanical properties.
Physical Properties
Density is approximately 8.00 g/cm³. The grade is non-magnetic in the annealed condition. Melting range is approximately 1370–1400°C.
Material Comparison
| Grade | Nitrogen | Carbon | Mo (%) | Strength Level | Weldability | Typical Preference |
|---|---|---|---|---|---|---|
| Type 316 | Low | ≤ 0.08 | 2.0–3.0 | Standard | Good | General chloride service |
| Type 316L | Low | ≤ 0.03 | 2.0–3.0 | Lower | Excellent | Welded chloride service |
| Type 316N | 0.10–0.16 | ≤ 0.08 | 2.0–3.0 | Higher | Good | Higher strength + chloride resistance |
| Type 316LN | Elevated | ≤ 0.03 | 2.0–3.0 | Higher | Excellent | Welded high-strength chloride service |
| Type 316Ti | Low | ≤ 0.08 | 2.0–3.0 | Standard | Good (stabilized) | High-temp welded chloride service |
| Type 2205 | Elevated | ≤ 0.03 | 3.0–3.5 | Much Higher | Good | High strength + high chloride resistance |
A240 Type 316N / UNS S31651 is selected when higher annealed strength than standard 316 is required while staying in the molybdenum-bearing austenitic family. For maximum as-welded intergranular corrosion resistance, SHH STEEL recommends a240 316l. For significantly higher strength and chloride resistance, compare with a240 2205.
Corrosion Resistance
A240 Type 316N offers corrosion resistance essentially equivalent to Type 316 in most environments. Molybdenum provides better resistance to pitting and crevice corrosion in chloride-containing media than a240 304. Nitrogen has a neutral to slightly beneficial effect on pitting resistance.
It performs well in chemical processing, marine atmospheres and many industrial environments. In highly concentrated chlorides or at elevated temperatures, pitting or stress corrosion cracking can still occur. For more severe chloride service, SHH STEEL recommends a240 317l or a240 2205.
Weldability
A240 Type 316N has good weldability using standard fusion welding methods. Matching or 316/316L filler metals are commonly used. Nitrogen content should be considered when developing welding procedures if weld-metal strength must match the base plate.
Because carbon can be as high as 0.08%, heavy welded constructions that cannot be post-weld heat treated are often better specified as 316L or 316LN. SHH STEEL recommends proper welding procedures and post-weld cleaning.
Heat Treatment
A240 Type 316N is normally supplied in the solution-annealed condition by SHH STEEL.
Recommended solution annealing temperature range is 1040–1120°C, followed by rapid cooling. Proper annealing keeps nitrogen in solid solution and optimizes both strength and corrosion resistance. SHH STEEL controls heat treatment to ensure consistent performance.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| 2B | Cold-rolled, annealed, pickled, skin-passed | A240 316N 2B / UNS S31651 2B – general fabrication |
| No.1 | Hot-rolled, annealed and pickled | A240 316N No.1 – industrial plate |
| BA | Bright Annealed | 316N BA – cleaner surface applications |
| No.4 | Brushed finish | 316N No.4 – architectural surfaces |
SHH STEEL regularly supplies A240 Type 316N in 2B and No.1 finishes, and can provide other finishes according to project requirements.
Tolerances
Dimensional tolerances for A240 Type 316N / UNS S31651 Stainless Steel Plate supplied by SHH STEEL generally conform to ASTM A480 practices.
Typical available size range is thickness 0.5 mm – 80 mm, width up to 2000–3000 mm, and length up to 12000 mm or cut-to-length. SHH STEEL provides precise dimensional control and can support tighter tolerances when required.
Equivalent Material Grades
| Grade / Designation | Standard / Region | Notes |
|---|---|---|
| A240 Type 316N | ASTM A240 / ASME SA240 | Plate specification |
| UNS S31651 | Unified Numbering System | Primary UNS designation |
| AISI 316N | AISI | Common commercial name |
| 1.4406 related | EN (Europe) | Closest European N-316 grades |
| SUS316N | JIS (Japan) | Japanese related grade |
| 06Cr17Ni12Mo2N related | GB/T (China) | Chinese related grade |
| Related 316 / 316L / 316LN | Multiple | Standard / low-carbon variants |
Related grades for comparison include a240 316, a240 316l, a240 316ti, a240 317l, a240 304 and a240 2205.
Applications
A240 Type 316N / UNS S31651 is selected when higher strength than standard 316 is required in chloride or chemical service. Typical applications of A240 Type 316N include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Pressure Vessels & Tanks | A240 Type 316N storage tanks, pressure vessels and containers |
| Chemical & Process Industry | UNS S31651 process equipment requiring elevated strength |
| Structural Fabrication | 316N high-strength frames and structural components |
| Marine & Offshore | A240 316N components in chloride environments needing higher strength |
| Architecture & Construction | 316N load-bearing and decorative panels |
| General Engineering | UNS S31651 high-strength fabricated parts |
SHH STEEL supplies A240 Type 316N for these strength-critical applications with consistent quality. For related industry solutions, see our petrochemical industry, marine industry, construction industry and equipment manufacturing pages. Supporting services include steel cutting services and steel welding services.
Why Choose SHH STEEL
SHH STEEL is a China steel mill-Direct Supply specializing in stainless steel plate and sheet. By working directly with major Chinese stainless steel mills, SHH STEEL supplies A240 Type 316N / UNS S31651 with the following advantages:
- Genuine China steel mill-Direct Supply pricing
- Consistent quality and complete heat traceability
- Full Mill Test Certificates (EN 10204 3.1)
- Nitrogen-strengthened 316N material optimized for higher strength and chloride resistance
- Flexible dimensions and surface finishes (including A240 316N 2B and A240 316N No.1)
- Technical support for selection among 316, 316L, 316N, 316Ti and duplex grades
- Value-added services including steel cutting services, steel welding services and worldwide shipping service
For more information about our company and full product range, please visit China steel Mill Agent-SHH STEEL.
FAQ
- What are the other common names for A240 Type 316N?It is also known as UNS S31651, AISI 316N, ASME SA240 Type 316N, SUS316N and nitrogen-strengthened 316. SHH STEEL can certify the required designation.
- What is the difference between 316N and 316 or 316L?316N contains 0.10–0.16% nitrogen, which significantly increases yield and tensile strength. Corrosion resistance stays in the 316 family. SHH STEEL recommends 316N when higher strength is required, and 316L when heavy welding is the priority.
- What is the difference between 316N and 316LN?Both are nitrogen-strengthened. 316LN has extra-low carbon (≤ 0.03%) for better resistance to intergranular corrosion after welding. SHH STEEL recommends 316LN for extensive welded constructions.
- Is A240 Type 316N magnetic?Non-magnetic in the annealed condition. It may become slightly magnetic after heavy cold working. SHH STEEL supplies fully annealed material as standard.
- What is the density of UNS S31651?Approximately 8.00 g/cm³. SHH STEEL provides material certificates confirming physical and mechanical properties.
- Can 316N replace duplex stainless steel?In some moderate-strength applications yes, but duplex grades such as 2205 offer much higher strength and better chloride resistance. SHH STEEL can help evaluate the better option.
- Does SHH STEEL supply dual-certified ASTM A240 Type 316N / UNS S31651 material?Yes, SHH STEEL commonly supplies dual-certified material upon request.
Conclusion
A240 Type 316N / UNS S31651 Stainless Steel Plate is a nitrogen-strengthened molybdenum-bearing austenitic grade that delivers higher yield and tensile strength than standard 316 while maintaining good pitting and crevice corrosion resistance. It is an excellent choice for pressure vessels, tanks, structural components and process equipment where increased strength and chloride resistance are both required.
As a professional China steel mill-Direct Supply and A240 Type 316N stainless steel plate supplier, SHH STEEL provides high-quality UNS S31651 plate with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including A240 316N 2B and A240 316N No.1), or a competitive quotation.
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