Table of Contents
- Introduction
- Chemical Composition
- Mechanical Properties
- Physical & Thermal Properties
- Equivalent Grades
- Union Details
- Manufacturing Process
- Sizes & Dimensions
- Types Available
- Applications
- Industries Served
- Grade Comparison
- Why BB Infras?
- Certifications & QC
- Export & Packaging
- Union Marking
- Coating Options
- Testing Procedure
- Storage Guidelines
- Downloads
- Cities We Supply
- Countries We Export
- FAQ
- People Also Ask
- Related Products
| Material | Austenitic Stainless Steel (300 Series) |
| Grade | Stainless Steel 316 / AISI 316 / ASTM A240 / EN 1.4401 |
| Standard | AISI 316 / ASTM A240 / EN 1.4401 |
| Type | Union |
| Size Range | Sheets 0.3–12 mm; plates up to 100 mm; tubes OD 6–610 mm; bars Ø 6–300 mm |
| Pressure Class | 2000# – 9000# (ASME B16.11) |
| Tensile Strength | 515–520 MPa |
| Yield Strength | 205 MPa min |
| MTC | EN 10204 3.1 Mill Test Certificate |
| MOQ | 100 kg (standard sizes) |
Quick Answers
Stainless Steel 316 Union – Overview
Stainless Steel 316 is the premium austenitic grade, adding 2–3% molybdenum to the SS 304 composition. This significantly enhances resistance to pitting, crevice corrosion and chloride attack, making it the material of choice for marine, pharmaceutical, chemical processing and food industry applications.
BB Infras is a dedicated Stainless Steel 316 Union supplier and exporter serving food processing, pharmaceutical, chemical processing and marine industry clients. Material is supplied with EN 10204 3.1 MTC, PMI test reports and surface-finish certification as standard. Stainless Steel 316 Union is supplied to ASME B16.11 in Class 2000#, 3000# and 6000# with NPT or socket weld ends. Sizes from ¼” to 4” NB are available ex-stock from our Mumbai warehouse.
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Request Quote WhatsAppChemical Composition of Stainless Steel 316
The following table shows the chemical composition per AISI 316 / ASTM A240 / EN 1.4401.
| C | Mn | Si | Cr | Ni | Mo | P | S | N |
|---|---|---|---|---|---|---|---|---|
| ≤ 0.08 | ≤ 2.00 | ≤ 1.00 | 16.00–18.00 | 10.00–14.00 | 2.00–3.00 | ≤ 0.045 | ≤ 0.030 | ≤ 0.10 |
Mechanical Properties of Stainless Steel 316
| Property | Value |
|---|---|
| Tensile Strength | 515–520 MPa |
| Yield Strength | 205 MPa min |
| Elongation | 40% min |
| Hardness | ≤ 217 HB |
Physical & Thermal Properties
| Property | Value |
|---|---|
| Density | 7.98 g/cm³ |
| Melting Point | 1370–1400 °C |
| Thermal Conductivity | 16.3 W/m·K |
| Thermal Expansion | 16.0 × 10⁻⁶ /°C |
| Elastic Modulus | 193 GPa |
| Specific Heat | 500 J/kg·K |
| Electrical Resistivity | 0.740 μΩ·m |
Equivalent Grades of Stainless Steel 316
| Standard Body | Equivalent Grade |
|---|---|
| AISI | 316 |
| EN/DIN | X5CrNiMo17-12-2 / 1.4401 |
| JIS | SUS316 |
| UNS | S31600 |
| BS | 316S31 |
Union – Product Details
Applicable Standards: ASME B16.11, BS 3799, MSS SP-83
Manufacturing Process: Forged from bar stock; precision machined seating faces (flat, 45° conical or ball type).
Heat Treatment: Solution anneal 1010–1120 °C, rapid quench. Non-hardenable by heat treatment.
Stainless Steel 316 Union – Manufacturing Process
Union is produced using a controlled sequence of operations to achieve the dimensional and mechanical requirements of AISI 316 / ASTM A240 / EN 1.4401.
900–1100 °C
Thread / Socket bore
Per ASME B16.11
Stainless Steel 316 Union – Sizes & Dimensions
Size range: Sheets 0.3–12 mm; plates up to 100 mm; tubes OD 6–610 mm; bars Ø 6–300 mm. The following dimensional data covers standard sizes. Non-standard sizes available on request.
| NPS | Class | End type | Approx OAL (mm) |
|---|---|---|---|
| ½" | 3000 | SW / Threaded | 80 |
| ¾" | 3000 | SW / Threaded | 90 |
| 1" | 3000 | SW / Threaded | 105 |
| 1½" | 3000 | SW / Threaded | 130 |
| 2" | 3000 | SW / Threaded | 150 |
| 3" | 2000 | Threaded | 200 |
Types of Stainless Steel 316 Union
- Socket Weld Union
- Threaded (NPT/BSP) Union
- Swivel Union
- Dielectric Union (anti-corrosion)
Applications of Stainless Steel 316 Union
Industries We Serve
Ready to order Stainless Steel 316 Union?
Stock available in Mumbai. Same-day quotation. Export documentation included.
Email Quote Call NowStainless Steel 316 – Grade Specification
| Standard | Category | Tensile Strength | Yield Strength | Elongation |
|---|---|---|---|---|
| AISI 316 / ASTM A240 / EN 1.4401 ✓ | Austenitic Stainless Steel (300 Series) | 515–520 MPa | 205 MPa min | 40% min |
| AISI (316) | Equivalent | See equivalent grades table above | ||
| EN/DIN (X5CrNiMo17-12-2 / 1.4401) | Equivalent | See equivalent grades table above | ||
| JIS (SUS316) | Equivalent | See equivalent grades table above | ||
| UNS (S31600) | Equivalent | See equivalent grades table above | ||
| BS (316S31) | Equivalent | See equivalent grades table above | ||
* All values are minimum guaranteed per AISI 316 / ASTM A240 / EN 1.4401. Actual mill certificates may show higher values.
Why Buy Stainless Steel 316 Union from BB Infras?
| Ready Stock | Large inventory of Stainless Steel 316 Union in popular sizes maintained in our Mumbai warehouse for immediate dispatch. |
| Certified Material | All material supplied with EN 10204 3.1 Mill Test Certificates from NABL-accredited labs. TPI by SGS, BV, TUV on request. |
| Worldwide Export | We export Stainless Steel 316 Union to 80+ countries with complete export documentation — COO, packing list, B/L, fumigation certificates. |
| Competitive Pricing | Direct mill sourcing and bulk buying ensures competitive prices. No middlemen. Transparent pricing with no hidden charges. |
| Fast Delivery | Standard sizes dispatched within 3–5 business days. Custom sizes within 3–4 weeks. Urgent orders accommodated. |
| Value-Added Services | Cut-to-length, bevelling, threading, galvanising, painting, marking & stencilling available in-house. |
| Technical Support | Our metallurgical team assists with grade selection, standard interpretation, and material substitution queries. |
| MSME Registered | Registered MSME supplier. Eligible for GeM portal procurement and government tenders. |
Certifications & Quality Inspection
Every Stainless Steel 316 Union supplied by BB Infras undergoes the following quality controls:
Quality Inspection Checklist
- Chemical composition analysis (OES / wet analysis)
- Mechanical testing: tensile, yield, elongation, impact
- Dimensional inspection per applicable ASME standard
- Visual and surface finish inspection
- Hydrostatic or pneumatic pressure testing
- Non-Destructive Testing: UT, RT, MT, PT on request
- Positive Material Identification (PMI) on request
Export Packaging & MOQ
- Minimum Order Quantity (MOQ): 100 kg or 1 piece (standard sizes); 500 kg for custom sizes
- Packing for Pipes/Tubes: Bundled with steel strapping, plastic end caps, moisture-proof wrapping
- Packing for Fittings/Flanges: Wooden box / wooden pallet, plywood case for heavy items
- Sea Freight: FCL / LCL container, fumigation certificate provided
- Air Freight: Available for urgent requirements
- Documents: Commercial Invoice, Packing List, Certificate of Origin, MTC, Bill of Lading, Insurance Certificate
- Marking: Heat number, grade, size, schedule, standard per ASTM A5.40 / ASME marking requirements
Union Marking & Identification
Every Stainless Steel 316 Union supplied by BB Infras is marked per AISI 316 / ASTM A240 / EN 1.4401 and ASME marking requirements. Standard marking sequence:
- Manufacturer name / mark
- Material specification — AISI 316
- Product type — Union
- Wall thickness / Schedule
- Heat / lot number — for MTC traceability
Coating & Surface Finish Options
| Coating Type | Standard | Application | Lead Time |
|---|---|---|---|
| Black (Mill Finish) | Per standard | General process service | In Stock |
| Yellow Zinc Chromate Primer | — | Corrosion protection in transit | In Stock |
| Hot-Dipped Galvanised (HDG) | ASTM A123 | Plumbing & utility service | 3–5 days |
| Two-Coat Epoxy | — | Chemical & offshore service | 1–2 weeks |
Testing & Inspection Procedure
All Stainless Steel 316 Union supplied by BB Infras undergo a multi-stage inspection and testing process before dispatch:
| # | Test / Inspection | Standard / Method | Acceptance |
|---|---|---|---|
| 1 | Chemical Composition (OES) | ASTM E415 | Per AISI 316 Table 1 |
| 2 | Tensile & Yield Strength | ASTM E8 | ≥515–520 MPa / ≥205 MPa min |
| 3 | Elongation | ASTM E8 | ≥40% min |
| 4 | Hardness (HB) | ASTM E10 | Per standard max |
| 5 | Hydrostatic Test | AISI 316 / ASME B31.3 | Leak-free at test pressure |
| 6 | Dimensional Inspection | ASME B16.9 / B16.11 | Within tolerance |
| 7 | Visual & Surface | ASTM A530 / MSS SP-55 | Free from defects |
| 8 | Ultrasonic Testing (UT) | ASTM E213 (on request) | No sub-surface defects |
| 9 | PMI (XRF) | ASTM E1476 (on request) | Grade confirmation |
Storage & Handling Guidelines
- Store on wooden dunnage or pipe racks — never directly on concrete to avoid moisture-induced corrosion.
- Stack with appropriate separators; observe safe stack heights to prevent deformation.
- Apply plastic end caps or plugs to all open ends to prevent ingress of moisture, dust and insects.
- Keep material dry and ventilated; store under cover in humid or coastal climates.
- Use nylon slings or padded lifting hooks — never bare wire rope directly on surface.
- For long-term storage (>6 months), re-apply protective oil coating or wrap with VCI (Vapour Corrosion Inhibitor) film.
- Identify items with heat number tags throughout storage for full MTC traceability.
Downloads & Technical Resources
Request product documentation from our technical team. Available on enquiry:
Contact our technical team with your enquiry details and we will share the relevant document within 24 hours.
Stainless Steel 316 Union Supplier in India
BB Infras supplies Stainless Steel 316 Union to customers across India from our Mumbai stockyard. We serve all major industrial hubs — refineries in Jamnagar and Haldia, petrochemical clusters in Dahej and Panipat, shipyards in Kochi and Visakhapatnam, and fabrication workshops across Pune, Rajkot, Surat and Coimbatore — with same-day quotation and fast dispatch.
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Stainless Steel 316 Union Exporter – Countries We Ship To
BB Infras exports Stainless Steel 316 Union to 80+ countries with complete export documentation — Certificate of Origin, Material Test Certificate, Packing List, Bill of Lading and Fumigation Certificate. We are a trusted exporter to UAE, Saudi Arabia, Qatar, Oman and Kuwait in the Middle East; to Singapore, Malaysia, Indonesia and Vietnam in Southeast Asia; to South Africa, Nigeria and Kenya in Africa; and to the USA, UK, Germany and Netherlands in Europe and North America.
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Frequently Asked Questions
Get the best price for Stainless Steel 316 Union
Talk to our sales team — available Mon–Sat, 9 AM – 7 PM IST. Same-day quotes.
Contact Us Today +91-9152677155People Also Ask
What standard does Stainless Steel 316 Union conform to?
Stainless Steel 316 Union conforms to ASME B16.11, BS 3799, MSS SP-83. Dimensional inspection is carried out per these standards before dispatch.
What end connections are available for Stainless Steel 316 Union?
Available with buttweld (BW) per ASME B16.25, socket weld (SW) and threaded (NPT/BSP) ends. Specify end connection at enquiry.
What is the tensile and yield strength of Stainless Steel 316?
Per AISI 316: minimum tensile is 515–520 MPa and minimum yield is 205 MPa min.
Do you supply Stainless Steel 316 Union with MTC?
Yes. EN 10204 3.1 Mill Test Certificates supplied with all products. TPI by SGS, TUV, BV or Lloyd's available on request.
What is the price of Stainless Steel 316 Union in India?
Prices vary by size, schedule, quantity and current market rates. Contact BB Infras for a firm quotation from our Mumbai stockyard.
Authoritative Standards Referenced
| Standard | Issuing Body | Scope |
|---|---|---|
| AISI 316 / ASTM A240 / EN 1.4401 | ASTM / ASME | Material specification for Stainless Steel 316 |
| ASME B16.11 | ASME | Forged fittings — socket welding and threaded |
| EN 10204:2004 | CEN | Metallic products — types of inspection documents (3.1 MTC) |
| NACE MR0175 / ISO 15156 | NACE/ISO | Materials for H₂S service in oil and gas production |
