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 | Carbon Steel |
| Grade | ASTM A106 Grade B / ASTM A106 Gr.B / ASME SA106 |
| Standard | ASTM A106 Gr.B / ASME SA106 |
| Type | Union |
| Size Range | NPS ½" – 26" (DN 15 – DN 650), SCH 10 to SCH 160 |
| Pressure Class | 2000# – 9000# (ASME B16.11) |
| Tensile Strength | 415 MPa min |
| Yield Strength | 240 MPa min |
| MTC | EN 10204 3.1 Mill Test Certificate |
| MOQ | 100 kg (standard sizes) |
Quick Answers
ASTM A106 Grade B Union – Overview
ASTM A106 Grade B is a seamless carbon steel pipe for high-temperature service up to 425 °C. Mandatory for fluid-handling in refineries, power plants and chemical plants where pressure integrity is critical.
BB Infras is a leading ASTM A106 Grade B Union supplier, stockist and exporter based in Mumbai, India. We maintain ready stock across popular sizes and schedules, backed by full traceability with EN 10204 3.1 Mill Test Certificates. ASTM A106 Grade B 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 ASTM A106 Grade B
The following table shows the chemical composition per ASTM A106 Gr.B / ASME SA106.
| C | Mn | P | S | Si | Cr | Cu | Mo | Ni | V |
|---|---|---|---|---|---|---|---|---|---|
| ≤ 0.30 | 0.29–1.06 | ≤ 0.035 | ≤ 0.035 | ≥ 0.10 | ≤ 0.40 | ≤ 0.40 | ≤ 0.15 | ≤ 0.40 | ≤ 0.08 |
Mechanical Properties of ASTM A106 Grade B
| Property | Value |
|---|---|
| Tensile Strength | 415 MPa min |
| Yield Strength | 240 MPa min |
| Elongation | 30% min (Gr.B) |
| Hardness | ≤ 197 HB |
Physical & Thermal Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1430–1530 °C |
| Thermal Conductivity | 50.0 W/m·K |
| Thermal Expansion | 12.0 × 10⁻⁶ /°C |
| Elastic Modulus | 200 GPa |
| Specific Heat | 480 J/kg·K |
| Electrical Resistivity | 0.172 μΩ·m |
Equivalent Grades of ASTM A106 Grade B
| Standard Body | Equivalent Grade |
|---|---|
| ASTM/ASME | A106/SA106 |
| EN/DIN | P265GH / 1.0425 |
| UNS | K03006 |
| BS | 3601 ERW 320 |
| JIS | STPG370 |
| IS | 1239 Part 1 |
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: Hot-finished; normalize 870–940 °C if cold worked. Hydro-tested per ASTM A530.
ASTM A106 Grade B Union – Manufacturing Process
Union is produced using a controlled sequence of operations to achieve the dimensional and mechanical requirements of ASTM A106 Gr.B / ASME SA106.
900–1100 °C
Thread / Socket bore
Per ASME B16.11
ASTM A106 Grade B Union – Sizes & Dimensions
Size range: NPS ½" – 26" (DN 15 – DN 650), SCH 10 to SCH 160. 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 ASTM A106 Grade B Union
- Socket Weld Union
- Threaded (NPT/BSP) Union
- Swivel Union
- Dielectric Union (anti-corrosion)
Applications of ASTM A106 Grade B Union
Industries We Serve
Ready to order ASTM A106 Grade B Union?
Stock available in Mumbai. Same-day quotation. Export documentation included.
Email Quote Call NowASTM A106 Grade B – Grade Specification
| Standard | Category | Tensile Strength | Yield Strength | Elongation |
|---|---|---|---|---|
| ASTM A106 Gr.B / ASME SA106 ✓ | Carbon Steel | 415 MPa min | 240 MPa min | 30% min (Gr.B) |
| ASTM/ASME (A106/SA106) | Equivalent | See equivalent grades table above | ||
| EN/DIN (P265GH / 1.0425) | Equivalent | See equivalent grades table above | ||
| UNS (K03006) | Equivalent | See equivalent grades table above | ||
| BS (3601 ERW 320) | Equivalent | See equivalent grades table above | ||
| JIS (STPG370) | Equivalent | See equivalent grades table above | ||
| IS (1239 Part 1) | Equivalent | See equivalent grades table above | ||
* All values are minimum guaranteed per ASTM A106 Gr.B / ASME SA106. Actual mill certificates may show higher values.
Why Buy ASTM A106 Grade B Union from BB Infras?
| Ready Stock | Large inventory of ASTM A106 Grade B 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 ASTM A106 Grade B 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 ASTM A106 Grade B 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 ASTM A106 Grade B Union supplied by BB Infras is marked per ASTM A106 Gr.B / ASME SA106 and ASME marking requirements. Standard marking sequence:
- Manufacturer name / mark
- Material specification — ASTM A106 Gr.B
- 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 ASTM A106 Grade B 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 ASTM A106 Gr.B Table 1 |
| 2 | Tensile & Yield Strength | ASTM E8 | ≥415 MPa min / ≥240 MPa min |
| 3 | Elongation | ASTM E8 | ≥30% min (Gr.B) |
| 4 | Hardness (HB) | ASTM E10 | Per standard max |
| 5 | Hydrostatic Test | ASTM A106 Gr.B / 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.
ASTM A106 Grade B Union Supplier in India
BB Infras supplies ASTM A106 Grade B 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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ASTM A106 Grade B Union Exporter – Countries We Ship To
BB Infras exports ASTM A106 Grade B 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 ASTM A106 Grade B 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 ASTM A106 Grade B Union conform to?
ASTM A106 Grade B 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 ASTM A106 Grade B 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 ASTM A106 Grade B?
Per ASTM A106 Gr.B: minimum tensile is 415 MPa min and minimum yield is 240 MPa min.
Do you supply ASTM A106 Grade B 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 ASTM A106 Grade B 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 |
|---|---|---|
| ASTM A106 Gr.B / ASME SA106 | ASTM / ASME | Material specification for ASTM A106 Grade B |
| 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 |
