Valve Components
Forged and machined valve bodies, bonnets, discs, wedges, stems, seats and balls in F304L, F316L, F51, F53, 17-4 PH, Monel 400, Inconel 625 and Hastelloy C276 — ASME B16.34 and NACE MR0175 compliant.
What is Valve Components?
Valve components are the forged and machined parts that make up a valve: bodies, bonnets, discs, wedges, balls, stems, seats, seat rings, gland followers and back-seat bushes. Steelco supplies these in ASTM A182 F304L, F316L, F51 Duplex, F53 Super Duplex, Monel 400, Inconel 625 and Hastelloy C276, forged to ASME B16.34 and machined to your drawing, with NACE MR0175 compliance and EN 10204 3.1 / 3.2 certification.
All grades we stock in valve components.
Click any grade for its full chemical composition, mechanical properties, equivalents and typical applications. Every grade ships with EN 10204 3.1 / 3.2 certification from our Mumbai stockyard.
Why Choose Valve Components
Forged, not cast
Closed-die forgings to ASTM A182 give a worked grain flow, higher integrity and no porosity — the requirement for Class 900 and above.
Machined to drawing
CNC turning, milling and boring to your GA and detail drawings, with tolerances to IT7 and surface finishes to Ra 0.4 µm on sealing faces.
Sour-service ready
NACE MR0175 / ISO 15156 compliant material with hardness capped at 22 HRC on duplex and 35 HRC on 17-4 PH double-aged trim.
Hardfaced sealing surfaces
Stellite 6 and 21 overlay on seats, wedges and discs, ground and lapped for tight shut-off.
Exotic alloy capability
Monel, Inconel 625, Hastelloy C276 and Alloy 20 trim for hydrofluoric, sulphuric and chloride services.
Full traceability
Heat number stamped on every part, with chemistry, mechanicals, impact, hardness and NDT reports bound into the dossier.
Technical Specifications
| Attribute | Details |
|---|---|
| Components Supplied | Bodies · Bonnets · Discs · Wedges · Balls · Stems · Seats & seat rings · Gland followers · Yoke nuts · Back-seat bushes |
| Standards | ASTM A182 / A276 / A479 · ASME B16.34 · API 600 / 602 / 6D · NACE MR0175 |
| Material Grades | F304 / F304L · F316 / F316L · F321 · F347 · F51 · F53 · F55 · 17-4 PH · Monel 400 · Inconel 625 · Hastelloy C276 · Alloy 20 |
| Size Range | 1/2" to 24" valve sizes; forgings from 0.2 kg to 800 kg |
| Pressure Class | Class 150 to Class 2500 · API 6D 2000 to 10000 psi |
| Condition | Solution annealed · quenched & tempered · double-aged (17-4 PH H1150M) |
| Hardfacing | Stellite 6 / 21 overlay, ENP, hard chrome and nitriding |
| Machining Tolerance | IT7 general · Ra 0.4 µm on seat and stem sealing surfaces |
| Testing | Chemistry, tensile, Charpy at –46 °C, hardness, DPT, UT, PMI, IGC per ASTM A262 / G48 |
| Certification | EN 10204 3.1 standard · 3.2 with TÜV, SGS, BV, Lloyd's witness · NACE compliance statement |
Grade availability by component
| Grade | UNS | Body / Bonnet | Stem | Disc / Wedge | Seat Ring | Ball |
|---|---|---|---|---|---|---|
| F304L / F316L | S30403 / S31603 | |||||
| 17-4 PH | S17400 | — | — | |||
| F51 Duplex | S31803 | |||||
| F53 Super Duplex | S32750 | |||||
| Monel 400 | N04400 | — | ||||
| Inconel 625 | N06625 | — | ||||
| Hastelloy C276 | N10276 | — |
Note: Forgings are supplied as-forged, proof machined or fully finished. Dies are developed in 3–5 weeks for new component geometries.
Use our free metal weight calculator — bars, sheets, plates, pipes and sections.
Grade chemistry and mechanical properties supplied in valve components.
Chemical composition and mechanical properties are grade properties, not form properties — the same grade keeps the same chemistry whether it is supplied as sheet, plate or coil. The tables below list the specified limits for each grade we stock in valve components, tested and certified to ASTM A182 / A276 / A479. Values are weight percent (maximum unless a range is shown); mechanical values are minima in the annealed condition.
Chemical composition (weight %)
| Grade | C | Mn | Si | P | S | Cr | Ni | N | Mo | Cu | Nb+Ta | Fe | W | Co |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A182 F304 / F304LUNS S30400 / S30403 | 0.08 (F304) / 0.030 (F304L) | 2.00 | 1.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–12.0 | 0.10 | — | — | — | — | — | — |
| ASTM A182 F316 / F316LUNS S31600 / S31603 | 0.08 (F316) / 0.030 (F316L) | 2.00 | 1.00 | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 0.10 | 2.0–3.0 | — | — | — | — | — |
| 17-4 PHUNS S17400 | 0.07 | 1.00 | 1.00 | 0.040 | 0.030 | 15.0–17.5 | 3.0–5.0 | — | — | 3.0–5.0 | 0.15–0.45 | — | — | — |
| ASTM A182 F51 DuplexUNS S31803 | 0.030 | 2.00 | 1.00 | 0.030 | 0.020 | 21.0–23.0 | 4.5–6.5 | 0.08–0.20 | 2.5–3.5 | — | — | — | — | — |
| ASTM A182 F53 Super DuplexUNS S32750 | 0.030 | 1.20 | 0.80 | 0.035 | 0.020 | 24.0–26.0 | 6.0–8.0 | 0.24–0.32 | 3.0–5.0 | 0.50 | — | — | — | — |
| Monel 400UNS N04400 | 0.30 | 2.00 | 0.50 | — | 0.024 | — | 63.0–Balance | — | — | 28.0–34.0 | — | 2.50 | — | — |
| Inconel 625UNS N06625 | 0.10 | 0.50 | 0.50 | — | — | 20.0–23.0 | 58.0–Balance | — | 8.00–10.0 | — | 3.15–4.15 | 5.00 | — | — |
| Hastelloy C276UNS N10276 | 0.010 | 1.00 | — | — | — | 14.5–16.5 | Balance | — | 15.0–17.0 | — | — | 4.0–7.0 | 3.0–4.5 | 2.50 |
Balance iron. Single figures are maximum limits. Mill test certificates to EN 10204 3.1 are issued with every dispatch.
Mechanical properties (annealed, minimum)
| Grade | Tensile Strength (min) | Yield Strength (min) | Elongation (min) | Condition | Tensile Strength (H900) | Yield Strength (H900) | Elongation in 50 mm | Hardness (Rockwell C) | Hardness (max) | Yield Strength (0.2%) | Hardness (Rockwell B) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A182 F304 / F304L | 515 MPa F304 / 485 MPa F304L | 205 MPa F304 / 170 MPa F304L | 30% | Solution annealed, 1040 °C min | — | — | — | — | — | — | — |
| ASTM A182 F316 / F316L | 515 MPa F316 / 485 MPa F316L | 205 MPa F316 / 170 MPa F316L | 30% | Solution annealed, 1040 °C min | — | — | — | — | — | — | — |
| 17-4 PH | — | — | — | — | 1310 MPa (190 ksi) | 1170 MPa (170 ksi) | 10% min | 40–48 | — | — | — |
| ASTM A182 F51 Duplex | 620 MPa (90 ksi) | 450 MPa (65 ksi) | 25% | — | — | — | — | — | 290 HBW | — | — |
| ASTM A182 F53 Super Duplex | 800 MPa (116 ksi) | 550 MPa (80 ksi) | 15% | — | — | — | — | — | 310 HBW | — | — |
| Monel 400 | 480 MPa (70 ksi) | — | — | — | — | — | 35% min | — | — | 170 MPa (25 ksi) | 75 approx |
| Inconel 625 | 827 MPa (120 ksi) | — | — | — | — | — | 30% min | — | — | 414 MPa (60 ksi) | 95 max, annealed |
| Hastelloy C276 | 690 MPa (100 ksi) | — | — | — | — | — | 40% min | — | — | 283 MPa (41 ksi) | 100 max |
Typical annealed values; actual results are stated on the heat-specific mill test certificate.
Application Sectors
Oil & Gas
Wellhead, choke and gate-valve trim in F51, F53 and Inconel 625 to NACE MR0175.
Refineries
High-temperature gate and globe valve bodies and wedges with Stellite-faced seats.
Chemical Plants
Hastelloy C276 and Alloy 20 trim for sulphuric, hydrochloric and mixed-acid duty.
Power Generation
Class 1500 / 2500 forged bodies and stems for main steam and feedwater valves.
Marine & Offshore
Super Duplex and Monel components for seawater lift, ballast and firewater systems.
Pharmaceutical
Electropolished 316L diaphragm valve bodies and hygienic seats.
Desalination
Duplex and Super Duplex bodies and balls for high-chloride brine service.
Fertiliser & Urea
Urea-grade 316L and Safurex-class trim resisting ammonium carbamate attack.
Cut, finished and certified to your drawing.
Material leaves our Mumbai facility finished to your specification — not as raw stock.
Why buy from Steelco.
Steelco Metal & Alloys is a Mumbai-based stockist, importer and exporter of stainless steel and nickel alloys, shipping certified material worldwide.
Quality & testing on every dispatch
- EN 10204 3.1 mill test certificate on every dispatch
- 3.2 certification with TÜV / SGS / BV / Lloyd's / IRS / IBR witness on request
- Positive Material Identification (PMI) with portable XRF / OES
- Dye-penetrant (DPT), ultrasonic (UT) and hydro testing on request
- NACE MR0175 / ISO 15156 compliance for sour service
- PED 2014/68/EU compliance for pressure equipment
- Heat-number stencilling and marking for full traceability
Deep ready stock
Forged bar and blanks held in Mumbai in F304L, F316L, F51, F53, 17-4 PH, Monel 400, Inconel 625 and Hastelloy C276 — proof-machined components typically dispatched in 2–4 weeks.
Mill-direct sourcing
Approved supply from Jindal, JSL, Outokumpu, Aperam, Acerinox, Sandvik and leading Japanese and Korean mills — every item traceable to a named producer.
Full certification
EN 10204 3.1 mill test certificate as standard, 3.2 with TÜV, SGS, BV, Lloyd's, IRS or IBR witness, plus PMI, DPT and UT reports on request.
On-time worldwide delivery
Regular export shipments to the GCC, Africa, Southeast Asia, Europe, Latin America and the USA via Nhava Sheva (JNPT), Mundra and Mumbai ports.
How your material is packed and shipped.
Every consignment leaves our Mumbai facility protected for transit and documented for customs, whether it moves by road within India or by sea to an overseas port.
Domestic & export packing
- Machined faces protected with rust-preventive coating and VCI film
- Individually wrapped and separated in wooden cases
- Foam or thermocol cradles for finished sealing surfaces
- Case-wise packing list cross-referenced to heat numbers
Global shipments
- HS Code: 8481 90
- FOB / CFR / CIF terms via Nhava Sheva (JNPT), Mundra and Mumbai ports
- Documentation: commercial invoice, packing list, MTC, bill of lading, COO, insurance
- Regular exports to the GCC, Africa, Southeast Asia, Europe, Latin America and the USA
Ready to price your requirement?
Share grade, size and quantity — our Mumbai desk responds with pricing, stock position and lead time, usually the same working day.
Frequently asked questions.
Answers to the questions our Mumbai desk is asked most often.
Do you supply valve components machined to our drawing?
+
Yes. Send the GA and detail drawings with material, class and test requirements. We forge or cut from stock bar, machine to your tolerances, hardface and test, then supply with a full documentation dossier.
Which material is used for valve stems in sour service?
+
17-4 PH in the double-aged H1150M condition and F51 / F53 duplex are the usual choices, with hardness controlled to NACE MR0175 limits — 22 HRC for duplex and 33 HRC maximum for 17-4 PH H1150M. Inconel 718 is specified for the most severe wells.
What is the difference between forged and cast valve bodies?
+
Forged bodies to ASTM A182 have a directional grain flow and no casting porosity, so they are used from Class 800 upwards and for small-bore high-pressure valves. Cast bodies to ASTM A351 are more economical in larger sizes where the pressure class is lower.
Can you hardface seats and wedges?
+
Yes. Stellite 6 or 21 is deposited by PTA or TIG overlay, then machined, ground and lapped to the required flatness and finish, with DPT and hardness verification on the deposited layer.
What testing and documentation do you provide?
+
Chemistry, tensile, Charpy impact at –46 °C, hardness, intergranular corrosion per ASTM A262, ferrite count and ASTM G48 corrosion testing on duplex, plus DPT, UT and PMI — all bound with EN 10204 3.1 or 3.2 certification.