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AISI 4140 Tube is a chromium-molybdenum alloy tube made to ASTM A519 Grade 4140 (also known as UNS G41400, DIN 1.7225 or SAE 4140). It's tough, holds up well under heavy load, and can be heat-treated anywhere from a soft annealed state up to 28–38 HRC. That's why it's the go-to choice for hydraulic cylinders, drive shafts and drilling gear. We stock it seamless and welded, 6mm to 610mm OD, ready to ship with MTC.
ASME SA519 & ASTM A519 Gr. 4140
Cross-referenced to SAE 4140, DIN 1.7225 & UNS G41400
Seamless & Welded (ERW/EFW)
Supplied round, square, rectangular or as coil
655 – 1200 MPa
Range shifts with heat-treatment condition
EN 10204 3.1 / 3.2
PMI & UT verification carried out on every heat
6mm – 610mm OD
Full range of wall thicknesses held ex-stock
Annealed • Normalized • Q&T
Quenched & tempered stock reaches 28–38 HRC
All Three Conditions, One Warehouse
Annealed, normalized and Q&T tube held together
Quotes Turned Around Fast
Firm pricing typically within 2 working days
Dual & Triple Standard Coverage
Certified to ASTM A519, ASME SA519 and DIN 1.7225 together
Prices Direct From The Stockyard
No broker layer added on top of mill rates
Cutting & Machining In-House
Length cutting, ID/OD turning done before dispatch
Shipped Worldwide By The Container
Regular FCL/LCL lanes to the Middle East, Africa and the Americas
📌 Table of Contents
Aesteiron Steels LLP is a leading Indian supplier and global stockist of high-strength AISI 4140 (UNS G41400 / DIN 1.7225) alloy tubes. Built for heavy-load applications like drive shafts and hydraulic cylinders, our seamless and welded inventory spans from annealed to Quenched & Tempered (28–38 HRC) conditions to outlast ordinary carbon steel
Our tubes are dual-certified to ASTM A519 Grade 4140 and ASME SA519, complete with mill test certificates and PMI verification. With deep ex-stock inventory managed through regional hubs in the Middle East, Africa, and the Americas, we provide immediate custom cutting, fast container dispatch, and direct pricing with zero middleman markup.
Backed by an ISO 9001:2015 quality system, our in-house metallurgical desk verifies every heat to ensure absolute material integrity. Serving a supply network across 80+ countries, we reliably deliver everything from single-length trial orders to full container projects on schedule.
Every AISI 4140 Tube Supplier in India spec you need is stocked and ready to match your drawing.
Every tube is chemistry-verified before dispatch, so the strength rating on paper matches what arrives at your yard.
Oil & Gas Drilling Tools
Hydraulic Cylinders
Automotive Drive Shafts
Gears & Spindles
Mining & Crushing Equipment
Crane Booms & Structural Arms
Bolts, Studs & Fasteners
Defense & Off-Highway Parts
This strength data comes straight from a proven AISI 4140 Tube Exporter in India
High hardenability holds through the section, so heat treatment response stays consistent even on thick walls.
Every OD on this chart is ready ex-stock with your AISI 4140 Tube Stockist in Mumbai.
| Size | 2 | 4 | 1 1/4 | 1 | 2 | 1 1/2 | 3 | 2 1/2 | 4 | 3 1/2 | 6 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| O.D. | 0.84 | 1.05 | 1.66 | 1.315 | 2.375 | 1.9 | 3.5 | 2.875 | 4.5 | 4 | 6.625 | 5.563 |
| W.T | 0.109 | 0.113 | 0.14 | 0.133 | 0.109 | 0.145 | 0.12 | 0.12 | 0.12 | 0.12 | 0.109 | 0.188 |
~870°C, air cool
~845°C soak
Rapid hardening
205–650°C
Dimensional stability
Wall thickness is checked heat-by-heat, so what ships matches the certificate down to the batch.
trusted AISI 4140 Tube Exporter in India converts any world standard with one call.
Thin wall to heavy wall stays on the shelf with your AISI 4140 Tube Stockist in Mumbai.
| OD Range | Construction | Wall Thickness | Typical Length |
|---|---|---|---|
| 25mm – 114mm | Seamless & Welded | 2mm – 12mm | 5–7m Random |
| 6mm – 25mm | Seamless / Capillary | 0.8mm – 4mm | Coil / Cut length |
| 273mm – 610mm | Welded (EFW) | 6mm – 50mm | Project-specific |
| 114mm – 273mm | Seamless & Welded | 4mm – 25mm | Up to 12m |
Every heat is chemistry checked by a certified AISI 4140 Tube Supplier in India before it ships.
| Element | Carbon (C) | Manganese (Mn) | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) | P (max) | S (max) |
|---|---|---|---|---|---|---|---|
| AISI 4140 | 0.38–0.43 | 0.75–1.00 | 0.15–0.35 | 0.80–1.10 | 0.15–0.25 | 0.035 | 0.040 |
Corner radii and wall uniformity are verified before dispatch, so the tube handles the load it is rated for.
AISI 4140 Tube Supplier in India keeps every tube form ready on the shelf.
Share your condition, size and schedule – Aesteiron’s desk replies with pricing, MTC and lead time within 48 hours.
Salzgitter Mannesmann
Jindal
Ratnamani Metals & Tubes
ISMT
Benteler Steel/Tube
Tenaris
Vallourec
ArcelorMittal Tubular
AISI 4140 Tube Stockist in Mumbai tests every batch before it ships for full traceability.
Ultrasonic Test
Positive Material ID
Hardness Test
EN 10204 3.1 / 3.2
Hydrostatic Test
3rd Party Inspection
Send your load, hardness and machining requirement – we will recommend Annealed, Normalized or Q&T AISI 4140 Tube.
AISI 4140 Tube – Regular Export Delivery Coverage
Rotary pierced into a hollow shell
4140 billet is heated & cleaned
Roller straightened to tolerance
Annealed, normalized or Q&T
UT, PMI, cut & pack for export
Sized to target OD & wall
TIG / GTAW Welding
MIG / MAG (GMAW) Welding
SMAW (Stick / MMA)
Submerged Arc Welding (SAW)
Flash Butt Welding
Friction / Orbital Welding
Continuous service is normally capped around 370°C to retain Q&T strength.
No inherent corrosion resistance – use VCI wrap or oil coating in storage.
Chloride-rich air accelerates pitting – coating or plating recommended.
Sour service needs NACE MR0175 qualified hardness & tempering.
Buried service needs external wrap or cathodic protection.
Open-yard storage streak-rusts tube – oil ends and tarp for protection.
Tell us grade, condition, size and destination port – we quote FCL/LCL freight along with ex-works price.
Aesteiron is a stocking distributor, stockholder and supplier of AISI 4140 Tube ex-stock in the following highlighted regions — not a reseller, a direct stock-holding partner.
Dubai, UAE Stockist Hub
Middle East distribution & re-export centre
Baku, Azerbaijan Distributor
Caspian & Caucasus stocking partner
Yerevan, Armenia Distributor
Caucasus region supply point
Cairo, Egypt Stock Holder
North Africa engineering tube stock
Casablanca & Tangier, Morocco Stockist
West Mediterranean port stocking
Algiers, Algeria Distributor
Maghreb region supply network
Lagos, Nigeria Stocking Distributor
West Africa oilfield & engineering supply
Dakar, Senegal Stock Holder
West Africa coastal distribution point
Seychelles Supplier
Indian Ocean island supply route
Addis Ababa, Ethiopia Distributor
East Africa engineering tube stockist
Johannesburg, South Africa Stockist Hub
Southern Africa distribution centre
Houston, USA Stocking Distributor
North America oilfield tube supply desk
Mexico City, Mexico Distributor
North & Central America supply link
Buenos Aires, Argentina Stock Holder
South America engineering tube stock
São Paulo, Brazil Stockist
South America industrial supply hub
4″ OD, 32 HRC, honed bore ready, EN 10204 3.1 MTC.
Hydraulic Cylinder Manufacturer, UAE
DUBAI, UAE6″ SCH 80, UT tested, third-party witnessed inspection.
Mining Equipment Fabricator, South Africa
JOHANNESBURG, SOUTH AFRICA2″ Cold drawn, Q&T 35 HRC, PMI verified, EN 10204 3.2.
Oilfield Services Contractor, USA
HOUSTON, TEXAS, USA3″ SCH 80, 33 HRC, UT tested, EN 10204 3.1 MTC.
Oil & Gas EPC Contractor, Saudi Arabia
DAMMAM, SAUDI ARABIA5″ OD, 302 HB, straightness certified, third-party witnessed inspection.
Mining & Mineral Processing Plant, Kenya
MOMBASA, KENYA8″ Large diameter, hydrostatic tested, EN 10204 3.1 MTC.
Off-Highway Equipment Manufacturer, USA
TULSA, OKLAHOMA, USAAISI 4140 Tube is widely specified for hydraulic cylinders, drive shafts, gears, mining and drilling equipment, crane booms and other structural parts.
Yes, DIN 1.7225, EN 42CrMo4 and JIS SCM440 are the recognised international equivalents of AISI 4140 / SAE 4140 chromium-molybdenum alloy steel tube.
In the annealed condition AISI 4140 Tube reads about 197 HB, in the normalized condition about 302 HB, and after quenching and tempering it can reach 28 to 38 HRC
AISI 4140 Tube can be welded, but it is an air-hardening steel, so preheat, controlled interpass temperature and post-weld heat treatment are recommended.
Yes, AISI 4140 Tube has considerably higher tensile and yield strength than mild steel tube because of its chromium-molybdenum alloy content
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Conclusion
AISI 4140 Tube in Annealed, Normalized and Quenched & Tempered condition, referenced to ASTM A519 Grade 4140 / ASME SA519, is the right choice for shafts, hydraulic cylinders and heavy equipment projects. Buyers across the Middle East, Africa and the Americas trust Aesteiron Steels LLP as one of the most responsive AISI 4140 Tube Suppliers for quick quotes.
Quick form – quote in 2 hours.
