The ASTM A105 floating ball valve is a forged steel floating ball valve for small-bore isolation, typically NPS 1/2 to 8 in Class 150 to 2500. Its forged A105 body gives a compact, weldable pressure boundary rated from −29 °C to +425 °C, and every valve is shell- and seat-tested to ISO 5208 Rate A before shipment.
ASTM A105 is the standard specification for forged carbon steel piping components, and it is the most common body material for small-bore industrial ball valves because a forged body has no casting porosity and machines to a compact, weldable shape. The term "A105 floating ball valve" therefore describes three independent things: the body material (ASTM A105, or its normalized form A105N), the closure geometry (a floating ball that line pressure pushes against the downstream seat), and the applicable design standard (API 6D for pipeline service, API 608 or ISO 17292 for process piping). A105 ball valves are normally supplied from NPS 1/2 to 8, Class 150 to 2500, with soft PTFE seats for clean media or metal seats for higher temperatures. This page covers the A105 floating ball valve range, the ASTM A105 composition and mechanical limits, the ISO 5208 sealing classes, and how to specify an order.
Technical Specifications
The table below sets out the A105 floating ball valve size range and pressure class. The A105 floating ball valve size range is NPS 1/2 to 8 (DN15 to DN200). The A105 floating ball valve pressure class range is Class 150 to 2500. Size and class are linked: the floating ball valve Class 150–2500 coverage holds at small sizes, but the usable size narrows as the class rises.
| Body material | ASTM A105 / A105N forged carbon steel |
|---|---|
| Size | NPS 1/2–8 (DN15–DN200) |
| Pressure class | Class 150–2500 (full range by size) |
| Body construction | Two-piece or three-piece bolted forged split body |
| Bore | Full bore or reduced bore |
| End connection | RF / RTJ flange, socket weld, butt weld, threaded |
| Seat | Soft PTFE / RPTFE / PEEK / Nylon; metal (Stellite or tungsten carbide) |
| Temperature | −29 °C to +200 °C (soft seat); to about +425 °C (metal seat, body limit) |
| Operation | Lever, worm gear, pneumatic or electric actuator (ISO 5211 pad) |
| Design standard | API 6D / API 608 / ISO 17292; ASME B16.34 |
| Face-to-face | ASME B16.10 |
| End flange | ASME B16.5 / ASME B16.47 |
| Test | API 598 / API 6D; ISO 5208 Rate A |
| Fire safe | API 607 / ISO 10497 |
| Sour service | NACE MR0175 / ISO 15156 (A105N, 22 HRC max) |
Chemical Composition
| Element | Composition, % | Element | Composition, % |
|---|---|---|---|
| C, max | 0.35 | Cu, max | 0.40 |
| Mn | 0.60–1.05 | Ni, max | 0.40 |
| Si | 0.10–0.35 | Cr, max | 0.30 |
| P, max | 0.035 | Mo, max | 0.12 |
| S, max | 0.040 | V, max | 0.08 |
The sum of Cu, Ni, Cr, Mo and V shall not exceed 1.00 %, and the sum of Cr and Mo shall not exceed 0.32 %. For each 0.01 % reduction below the carbon maximum of 0.35 %, manganese may be raised 0.06 % above 1.05 % up to a maximum of 1.65 %.
Mechanical Properties
| Property | Requirement |
|---|---|
| Tensile strength, min | 485 MPa (70 ksi) |
| Yield strength, min | 250 MPa (36 ksi) |
| Elongation, 2 in / 50 mm, min | 30 % (22 % for small sizes) |
| Reduction of area, min | 30 % |
| Hardness, max | 197 HBW |
The ASTM A105 hardness 197 HBW maximum applies to the finished forging and is verified by Brinell testing. Hardness is also the controlling property for NACE MR0175 sour service, where it must be held at or below 22 HRC (237 HBW).
Pressure Class and Test Pressure
| Class | Shell test, MPa | Seat test (high pressure), MPa | Low-pressure seat test, MPa |
|---|---|---|---|
| 150 | 3.0 | 2.2 | 0.6 |
| 300 | 7.7 | 5.6 | 0.6 |
| 600 | 15.3 | 11.0 | 0.6 |
Material Comparison
| Grade | Description | Service temperature | Tensile / Yield, MPa |
|---|---|---|---|
| ASTM A105 | Forged carbon steel | −29 to +425 °C | 485 / 250 |
| ASTM A105N | Normalized forged carbon steel | −29 to +425 °C | 485 / 250 |
| ASTM A350 LF2 | Forged low-temperature carbon steel | −46 to +425 °C | 485 / 250 |
| ASTM A216 WCB | Cast carbon steel | −29 to +425 °C | 485 / 250 |
| ASTM A182 F316 | Forged 316 stainless steel | −196 to +425 °C | 515 / 205 |
The ASTM A105 temperature range is −29 °C to +425 °C under ASME B16.34, and the seat and packing limits usually govern. A105 vs A350 LF2 is the common low-temperature decision: A105 stops at the A105 ball valve temperature −29 °C limit, while A350 LF2 reaches −46 °C. For cold service, specify an API 6D floating ball valve or an API 608 floating ball valve with an A350 LF2 body rather than A105.
Why Source From Us
GNEE is an A105 floating ball valve supplier serving EPC contractors, distributors and plant operators in oil, gas, petrochemical and utility markets. We supply A105 and A105N floating ball valves from NPS 1/2 to 8, Class 150 to 2500, with the full documentation set and options for low-emission packing, fire-safe and NACE sour-service service. Every valve is shell- and seat-tested before shipment, and we act as your supplier for both project and distributor programs.
Verified material: Forged A105 and A105N bodies with EN 10204 3.1 certificates, heat-number marking and PMI, so the material on the certificate matches the valve in the line.
Documented testing: 100 % shell and seat pressure testing to API 598 / API 6D, with ISO 5208 Rate A shutoff records, and fire-safe and low-emission qualification on request.
Sour-service capability: A105N normalized bodies and sour-rated bolting to NACE MR0175 / ISO 15156, with hardness records and PMI for every order.
Send us the size (NPS or DN), pressure class, body material (A105 or A105N), seat type (soft or metal), end connection and any fire-safe, low-emission or NACE requirement. We return a technical submittal and an itemized proposal with MTC, test records and third-party inspection options.
FAQ
What is an ASTM A105 floating ball valve used for?
It is a small-bore quarter-turn isolation valve for clean liquid, gas and steam service, used on process, utility and pipeline lines. The forged A105 body suits compact, weldable installations, and the floating ball gives tight bidirectional shutoff from Class 150 to 2500.
What size and pressure class does an A105 floating ball valve cover?
The standard range is NPS 1/2 to 8 (DN15 to DN200) in Class 150 to 2500. The usable size narrows as the class rises: full size range at Class 150 to 300, roughly NPS 1/2 to 4 at Class 600, and NPS 1/2 to 2 at Class 900 to 1500.
What is the temperature range of an ASTM A105 ball valve?
ASTM A105 is rated from −29 °C to +425 °C under ASME B16.34. With PTFE seats the practical limit is about +200 °C; metal seats and graphite packing extend it toward +400 °C. Below −29 °C the material is not permitted, and A350 LF2 or an austenitic grade must be used instead.
What leakage class does a floating ball valve achieve?
Soft-seated A105 floating ball valves meet ISO 5208 Rate A, effectively no visible leakage, on suitable clean media. Metal-seated valves meet Rate D. The control-valve classes ANSI/FCI 70-2 Class IV to VI do not apply to quarter-turn ball valves.
Can an A105 floating ball valve be used in sour service?
Yes, if the body is A105N normalized to NACE MR0175 / ISO 15156 and hardness is verified at or below 22 HRC, with PMI and hardness records supplied. Sour service also requires sour-rated bolting and a trim that meets the hardness limit; the requirement must be written into the purchase order before the forgings are made.
What is the A105 floating ball valve price, MOQ and lead time?
MOQ is one set for standard sizes and ratings, and the A105 floating ball valve price depends on size, class, seat type and documentation. Typical lead time is 15 to 30 days after payment confirmation for standard configurations, and longer for special face-to-face dimensions, exotic trims or third-party witness testing. Samples are available on request.
What documents and certificates come with an order?
Each order ships with an MTC EN 10204 3.1 (mill test certificate), shell and seat pressure-test records to API 598 / API 6D, and a NACE compliance declaration and PMI report where sour service is specified. Third-party inspection by SGS, TUV or DNV can be arranged at the buyer's cost.
Can you supply OEM and custom face-to-face dimensions?
Yes. We supply OEM and ODM valves with custom face-to-face dimensions, end configurations, body markings and branding, and can produce dimensional general arrangement drawings and torque calculations for actuator sizing before the order is placed.