Table of Contents
- Introduction
- Chemical Composition
- Mechanical Properties
- Physical & Thermal Properties
- Equivalent Grades
- Seamless Pipes Details
- Manufacturing Process
- Sizes & Dimensions
- Weight Chart
- Pressure Rating
- Types Available
- Applications
- Industries Served
- Grade Comparison
- Why BB Infras?
- Certifications & QC
- Export & Packaging
- Seamless Pipes Marking
- Coating Options
- Testing Procedure
- Storage Guidelines
- Downloads
- Cities We Supply
- Countries We Export
- FAQ
- People Also Ask
- Related Products
| Material | Medium Carbon Steel (Improved) |
| Grade | EN8D / BS 970 080M40 EN8D |
| Standard | BS 970 080M40 EN8D |
| Pipe Type | Seamless |
| Size Range | Bars Ø 6–200 mm; bright drawn and ground bar |
| Schedule | SCH 10 – XXS (per ASME B36.10M) |
| Length | SRL (3–5 m) / DRL (6–12 m) / Cut-to-length |
| End Finish | Plain End (PE) / Bevel End (BE) / Threaded (TE) |
| Tensile Strength | 600–750 MPa (HT) |
| Yield Strength | 310 MPa min |
| MTC | EN 10204 3.1 Mill Test Certificate |
| MOQ | 100 kg (standard sizes) |
Quick Answers
EN8D Seamless Pipes – Overview
EN8D is a refined EN8 grade with tighter manganese control for improved machinability and consistency. Often specified for CNC-turned components and automotive parts where dimensional accuracy is critical.
BB Infras stocks EN8D Seamless Pipes in rounds, hexagonals and profiles from leading Indian and European mills, regularly supplied to gear manufacturers, machine builders and automotive component suppliers with hardness and impact test reports on request. We supply EN8D Seamless Pipes in schedules SCH 10 through XXS, in lengths from 3 m single random to 6 m double random, with plain end, bevel end or threaded end as required. PE/BE/TE pipes are stocked for same-day dispatch.
Need a quote for EN8D Seamless Pipes?
Our sales team responds within 2 business hours with price & availability.
Request Quote WhatsAppChemical Composition of EN8D
The following table shows the chemical composition per BS 970 080M40 EN8D.
| C | Mn | Si | P | S |
|---|---|---|---|---|
| 0.36–0.44 | 0.70–1.00 | 0.10–0.40 | ≤ 0.040 | ≤ 0.040 |
Mechanical Properties of EN8D
| Property | Value |
|---|---|
| Tensile Strength | 600–750 MPa (HT) |
| Yield Strength | 310 MPa min |
| Elongation | 15% min |
| Hardness | 170–230 HB |
Physical & Thermal Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1420–1460 °C |
| Thermal Conductivity | 50 W/m·K |
| Thermal Expansion | 11.2 × 10⁻⁶ /°C |
| Elastic Modulus | 210 GPa |
| Specific Heat | 460 J/kg·K |
| Electrical Resistivity | 0.170 μΩ·m |
Equivalent Grades of EN8D
| Standard Body | Equivalent Grade |
|---|---|
| BS | 080M40 EN8D |
| DIN | Ck40 / 1.1186 |
| AISI | 1039 |
| JIS | S38C |
Seamless Pipes – Product Details
Applicable Standards: ASTM A106, API 5L, ASME B36.10, EN 10216, IS 3589
Manufacturing Process: Hot extrusion or Mannesmann rotary-piercing of solid billets, followed by elongation on a plug/mandrel mill and sizing.
Heat Treatment: Harden 820–850 °C oil quench; Temper 580–620 °C for balanced properties.
EN8D Seamless Pipes – Manufacturing Process
Seamless Pipes is produced using a controlled sequence of operations to achieve the dimensional and mechanical requirements of BS 970 080M40 EN8D.
1200–1280 °C
Mannesmann
Plug / Mandrel Mill
As-rolled / Normalised
Per standard
EN8D Seamless Pipes – Sizes & Dimensions
Size range: Bars Ø 6–200 mm; bright drawn and ground bar. The following dimensional data covers standard sizes. Non-standard sizes available on request.
| NPS | OD (mm) | SCH 40 WT (mm) | SCH 80 WT (mm) |
|---|---|---|---|
| ½" | 21.3 | 2.77 | 3.73 |
| 1" | 33.4 | 3.38 | 4.55 |
| 2" | 60.3 | 3.91 | 5.54 |
| 4" | 114.3 | 6.02 | 8.56 |
| 6" | 168.3 | 7.11 | 10.97 |
| 8" | 219.1 | 8.18 | 12.70 |
| 10" | 273.1 | 9.27 | 12.70 |
| 12" | 323.9 | 9.53 | 12.70 |
EN8D Seamless Pipes – Weight Chart
Weight per metre (kg/m) for common sizes and schedules. Formula: W = 0.02466 × t × (OD − t) where t = wall thickness (mm), OD = outside diameter (mm).
| NPS | OD (mm) | SCH 40 WT (mm) | SCH 40 kg/m |
SCH 80 WT (mm) | SCH 80 kg/m |
SCH 160 WT (mm) | SCH 160 kg/m |
|---|---|---|---|---|---|---|---|
| ½" | 21.3 | 2.77 | 1.27 | 3.73 | 1.62 | 4.78 | 1.95 |
| ¾" | 26.7 | 2.87 | 1.69 | 3.91 | 2.20 | 5.56 | 2.90 |
| 1" | 33.4 | 3.38 | 2.50 | 4.55 | 3.24 | 6.35 | 4.24 |
| 1½" | 48.3 | 3.68 | 4.05 | 5.08 | 5.41 | 7.14 | 7.25 |
| 2" | 60.3 | 3.91 | 5.44 | 5.54 | 7.48 | 8.74 | 11.11 |
| 3" | 88.9 | 5.49 | 11.29 | 7.62 | 15.27 | 11.13 | 21.35 |
| 4" | 114.3 | 6.02 | 16.07 | 8.56 | 22.32 | 13.49 | 33.57 |
| 6" | 168.3 | 7.11 | 28.26 | 10.97 | 42.56 | 14.27 | 54.20 |
| 8" | 219.1 | 8.18 | 42.55 | 12.70 | 64.64 | 15.09 | 75.92 |
| 10" | 273.1 | 9.27 | 60.31 | 12.70 | 81.55 | 15.09 | 95.97 |
| 12" | 323.9 | 9.53 | 73.78 | 12.70 | 97.44 | 17.48 | 132.05 |
* Weights are approximate and calculated per ASME B36.10M. Actual weights may vary ±2% depending on mill tolerance.
EN8D Seamless Pipes – Pressure Rating
Allowable working pressure (bar) per ASME B31.3 at ambient temperature (38 °C). Pressure reduces at elevated temperature — consult ASME B31.3 Table A-1.
| NPS | OD (mm) | SCH 40 WT (mm) | SCH 40 Pressure (bar) |
SCH 80 WT (mm) | SCH 80 Pressure (bar) |
SCH 160 WT (mm) | SCH 160 Pressure (bar) |
|---|---|---|---|---|---|---|---|
| ½" | 21.3 | 2.77 | 387 | 3.73 | 521 | 4.78 | 668 |
| ¾" | 26.7 | 2.87 | 320 | 3.91 | 436 | 5.56 | 620 |
| 1" | 33.4 | 3.38 | 301 | 4.55 | 405 | 6.35 | 566 |
| 1½" | 48.3 | 3.68 | 227 | 5.08 | 313 | 7.14 | 440 |
| 2" | 60.3 | 3.91 | 193 | 5.54 | 273 | 8.74 | 431 |
| 3" | 88.9 | 5.49 | 184 | 7.62 | 255 | 11.13 | 373 |
| 4" | 114.3 | 6.02 | 157 | 8.56 | 223 | 13.49 | 351 |
| 6" | 168.3 | 7.11 | 126 | 10.97 | 194 | 14.27 | 252 |
| 8" | 219.1 | 8.18 | 111 | 12.70 | 173 | 15.09 | 205 |
| 10" | 273.1 | 9.27 | 101 | 12.70 | 138 | 15.09 | 164 |
| 12" | 323.9 | 9.53 | 88 | 12.70 | 117 | 17.48 | 161 |
* Pressures are indicative, calculated using Barlow's formula with 72% SMYS design factor. For engineering design, refer to ASME B31.3 / B31.1.
Types of EN8D Seamless Pipes
- Round seamless
- Square & rectangular hollow sections
- Boiler tubes (cold-drawn)
- Hydraulic & precision tubes
Applications of EN8D Seamless Pipes
Industries We Serve
Ready to order EN8D Seamless Pipes?
Stock available in Mumbai. Same-day quotation. Export documentation included.
Email Quote Call NowEN8D – Grade Specification
| Standard | Category | Tensile Strength | Yield Strength | Elongation |
|---|---|---|---|---|
| BS 970 080M40 EN8D ✓ | Medium Carbon Steel (Improved) | 600–750 MPa (HT) | 310 MPa min | 15% min |
| BS (080M40 EN8D) | Equivalent | See equivalent grades table above | ||
| DIN (Ck40 / 1.1186) | Equivalent | See equivalent grades table above | ||
| AISI (1039) | Equivalent | See equivalent grades table above | ||
| JIS (S38C) | Equivalent | See equivalent grades table above | ||
* All values are minimum guaranteed per BS 970 080M40 EN8D. Actual mill certificates may show higher values.
Why Buy EN8D Seamless Pipes from BB Infras?
| Ready Stock | Large inventory of EN8D Seamless Pipes 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 EN8D Seamless Pipes 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 EN8D Seamless Pipes 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
Seamless Pipes Marking & Identification
Every EN8D Seamless Pipes supplied by BB Infras is marked per BS 970 080M40 EN8D and ASME marking requirements. Standard marking sequence:
- Manufacturer name / mark — BB Infras or mill of origin
- Specification — BS 970 080M40 EN8D
- Grade — EN8D
- Type — S (Seamless)
- Size & schedule — NPS × SCH or wall thickness
- Heat / lot number — for full traceability to MTC
- Length — actual pipe length in metres
- NDE symbol — if nondestructive examination was performed
Coating & Surface Finish Options
| Coating Type | Standard | Application | Lead Time |
|---|---|---|---|
| Black (Mill Finish) | Per standard | General service, indoor piping | In Stock |
| Hot-Dipped Galvanised (HDG) | ASTM A123 | Outdoor, water & plumbing | 3–5 days |
| Oil Coated | — | Export transit corrosion protection | In Stock |
| FBE (Fusion Bonded Epoxy) | CSA Z245.20 | Underground water/gas pipelines | 2–3 weeks |
| 3LPE (3-Layer Polyethylene) | DIN 30670 | Buried oil & gas pipelines | 2–3 weeks |
| Coal Tar Epoxy | AWWA C203 | Offshore & marine | 1–2 weeks |
Testing & Inspection Procedure
All EN8D Seamless Pipes 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 BS 970 080M40 EN8D Table 1 |
| 2 | Tensile & Yield Strength | ASTM E8 | ≥600–750 MPa (HT) / ≥310 MPa min |
| 3 | Elongation | ASTM E8 | ≥15% min |
| 4 | Hardness (HB) | ASTM E10 | Per standard max |
| 5 | Hydrostatic Test | BS 970 080M40 EN8D / ASME B31.3 | Leak-free at test pressure |
| 6 | Dimensional Inspection | ASME B36.10M | 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.
EN8D Seamless Pipes Supplier in India
BB Infras supplies EN8D Seamless Pipes 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.
View all cities we supply ▾
EN8D Seamless Pipes Exporter – Countries We Ship To
BB Infras exports EN8D Seamless Pipes 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.
View all export countries ▾
Frequently Asked Questions
Get the best price for EN8D Seamless Pipes
Talk to our sales team — available Mon–Sat, 9 AM – 7 PM IST. Same-day quotes.
Contact Us Today +91-9152677155People Also Ask
Is EN8D pipe seamless or welded?
EN8D is available in both seamless and welded (ERW, SAW) forms under BS 970 080M40 EN8D. BB Infras stocks seamless Seamless Pipes and welded variants. Seamless offers higher burst pressure and superior fatigue resistance.
What schedules are available for EN8D Seamless Pipes?
Per ASME B36.10M: SCH 10, 20, 30, 40 (Standard), 60, 80 (Extra Strong), 100, 120, 140, 160 and XXS. BB Infras stocks SCH 40 and SCH 80 in popular sizes for immediate dispatch.
Can EN8D pipe be hot-dip galvanised?
Yes. Galvanising per ASTM A123 is available. Galvanised EN8D pipe is suitable for water supply, plumbing and outdoor structural applications. Specify HDG at time of enquiry.
What is the tensile and yield strength of EN8D?
Per BS 970 080M40 EN8D: minimum tensile is 600–750 MPa (HT) and minimum yield is 310 MPa min. Actual mill certificates typically show values 5–15% above the standard minimum.
What is the price of EN8D Seamless Pipes in India?
Prices vary by size, schedule, quantity and current steel market rates. Contact BB Infras for a firm quotation from our Mumbai stockyard.
Authoritative Standards Referenced
| Standard | Issuing Body | Scope |
|---|---|---|
| BS 970 080M40 EN8D | ASTM / ASME | Material specification for EN8D |
| ASME B36.10M | ASME | Welded and seamless wrought steel pipe — dimensional standard |
| ASTM A530 | ASTM | General requirements for specialised carbon and alloy steel pipe |
| 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 |
