AISI 4130 pipe and fittings for high-pressure oil and gas lines
Seamless pipe to ASTM A519 Grade 4130 and heavy-wall fittings for choke and kill, cement, mud, well test and frac lines: butt-weld elbows, tees and reducers, long sweep elbows, and integral fittings with hammer union ends. Heat treated to the strength and hardness on your order, tested, and shipped with EN 10204 3.1 certificates from our works in India to buyers from Houston and the Permian to the Bakken and the Marcellus.
- EN 10204 3.1 with every order
- Sour service to NACE MR0175
- Heat number on every part
- Small mixed orders welcome
Where each 4130 part sits in a high-pressure line
Pressure in the line
- 4130 seamless pipeASTM A519 Grade 4130, heavy wallNPS 1 to 8, or OD by ID
- Long sweep elbowGentle turns in choke, kill, cement and mud lines7,500 to 15,000 psi
- TeeBranches and manifold headersEqual and reducing
- ReducerSize changes along the lineConcentric, eccentric
- Integral fittingUnion-end tees, crosses and ells, no weldsFIG 602, 1002 and 1502
- Elbow45°, 90° and 180° turnsSch 80 to XXS and heavier
The 4130 range
Every part is made to your line list in AISI 4130 chromium-molybdenum steel, from a few fittings to a full manifold package, and heat treated to one strength level and hardness so every weld in the line joins like with like.
4130 seamless pipe
ASTM A519 Grade 4130, NPS 1 to 8 and OD by ID heavy wall, normalized or quenched and tempered.
Sch 80 to XXS, 7.5K to 15K4130 long sweep fittings
Long sweep elbows, 45° and 90°, with weld or union ends for erosive high-pressure lines.
2 to 6 in XXS, 15K4130 integral fittings
One-piece tees, crosses, ells and laterals with hammer union ends, no welds.
FIG 602, 1002, 1502What goes on a 4130 order
There is no ASTM fitting grade for 4130, and ASTM A519 sets no strength for the pipe, so a 4130 order is only complete when it states the properties. These are the facts we quote against.
| Attribute | What we supply |
|---|---|
| Material | AISI 4130 (UNS G41300); pipe to ASTM A519 Grade 4130 |
| Strength | API 6A 75K, L80 type, or 85 ksi min yield for 15K |
| Heat treatment | Normalized, quenched and tempered, stress relieved |
| Hardness | 22 HRC max for sour service, NACE MR0175 / ISO 15156-2 |
| Pressure | 7,500, 10,000 and 15,000 psi lines |
| Size and wall | NPS 1 to 8, Sch 80 to XXS; heavy wall by OD and ID |
| Ends | Butt weld to ASME B16.25; hammer union FIG 602 to 1502 |
| Documents | EN 10204 3.1; 3.2 with your inspector |
Two complete line items
Long sweep elbow, 90°, 3 in XXS bore, butt weld to ASME B16.25, AISI 4130 quenched and tempered, 85 ksi min yield, 110 ksi min tensile, for 15,000 psi, EN 10204 3.1, 6 pcs
Equal tee, 3 in XXS, butt weld to ASME B16.25, AISI 4130 quenched and tempered, 75 ksi min yield, 95 ksi min tensile, 22 HRC max, NACE MR0175 / ISO 15156-2, EN 10204 3.1, 4 pcs
Each callout is explained in our guides: strength levels, heat treatment, sour service and pressure ratings.
Built for the iron that sees the pressure
Frac, flowback and well test lines are rigged up, hammered, pumped through at 15,000 psi with sand in the flow, then broken down and moved to the next pad. Choke and kill lines wait for the moment a well kicks. Both need parts whose strength, hardness and wall are known, not assumed.
- Integral fittings with the union ends machined from the body, so there is no weld in the pressure boundary.
- Long sweep elbows with extra wall in the body, where entrained solids strike.
- Hardness controlled to 22 HRC for sour service and checked in our own lab.
- Heat number stamped on every part and printed on its certificate.
The rest of the line
The same order can carry the flowline iron, wellhead and manifold parts and plant fittings around your 4130 lines, quoted together and shipped with one set of documents.
Flowline equipment
Hammer unions, crossovers, swivels, pup joints, plug, check and relief valves, chokes and beans.
FIG 602 to 2002Wellhead and manifold parts
API 6A flanges, ring gaskets, studded crosses, hubs and clamps, manifolds, API 5CT pups and couplings.
2,000 to 20,000 psiIndustrial range
Ball, butterfly and forged steel valves, camlocks, forged fittings, nipples, swages and flanges.
Class 150 to 9000Hammer unionsSwivel jointsPlug valvesChokesAPI 6A flangesStudded crossesManifoldsDouble backs and goosenecks
Made and tested at our works
Our 4130 parts are cut, forged, heat treated, machined and tested at our works in Gujarat, India. Heat treatment is recorded on furnace charts; tensile, hardness and PMI tests run in our own lab; impact, ultrasonic and magnetic particle tests are done at accredited outside laboratories. Your inspector is welcome at any stage.
- Forming
- Forged and machined
- Heat treatment
- Furnace charts on file
- In-house lab
- Tensile, hardness, PMI
- Outside labs
- Charpy, UT, MPI
- Certificates
- EN 10204 3.1 and 3.2
Engineering guides for 4130 lines
Short, practical notes for the engineers and buyers who specify, order and inspect 4130 parts.
- 4130 for sour serviceISO 15156-2 limits for 4130: 22 HRC, nickel, heat treatment, weld hardness and PWHT.
- Pressure ratingsWorking, cold working and test pressure; API 6A test pressures; B16.9 and union figure ratings.
- 4130 75K, 80K and L80API 6A designations, L80 limits, hardness caps, and a callout template.
- Long sweep vs targeted teeDirection changes in choke and kill lines, targets and cushions, and the R/d of 10 rule.
- Hammer union figuresFIG 100 to 2002 ratings, sour gas versions, and why figures must never be mixed.
- 4130 vs 4140Chemistry, hardenability, strength, carbon equivalent and which to use where.
Where we ship in the US
Every order ships from India to the region where it will work, and each region asks something different of high-pressure equipment.
- Houston, TXMost Houston orders are for parts that go into equipment built here: heavy-wall pipe and fittings, long sweeps, studded blocks and flanges, or complete manifolds to drawing.
- Permian BasinReplacement iron for frac and flowback fleets makes up most Permian orders, often with a share in sour service.
- Eagle FordFlowback and test equipment, and the trim that wears in it, lead Eagle Ford orders.
- HaynesvilleHigh-pressure lines and the fittings, flanges and chokes rated to match them lead Haynesville orders.
- BakkenFlowline iron and wellhead parts ordered with low-temperature impact tests lead Bakken orders.
- OklahomaUnion iron in several figures, the crossovers between them, and water-handling valves and couplings lead Oklahoma orders.
- Marcellus and UticaFrac and flowback iron, and the chokes and trims that wear in gas flowback, lead Appalachian orders.
- Gulf of AmericaChoke and kill line fittings, studded blocks, flanges and hubs, and manifolds to drawing lead offshore orders.