+91-9619103479
or
vishal@solitaire-overseas.com
ASTM A234 WP23 Buttweld Fittings
ASTM A234 WP23 Buttweld Fittings
Grade 23 was developed for boiler tubes and headers, which means the buttweld form is closer to its intended home than the forged one. It sits deliberately between P22 and P91: more creep strength than 2.25Cr-1Mo, achieved with a tungsten addition, without the narrow tempering window and mandated consumables that make Grade 91 demanding to fabricate. Solitaire Overseas supplies A234 WP23 buttweld fittings from India to order. It is an uncommon grade and we say so rather than implying stock.
Part of our alloy steel fittings range. Forged form: ASTM A182 F23. Closest neighbour: WP24 buttweld fittings.
Between Grade 22 and Grade 91
Grades 23 and 24 were both developed to answer the same complaint: P22 runs out of creep strength before the designer wants it to, and P91 solves that but brings a fabrication regime many projects would rather avoid, narrow tempering windows, mandated welding consumables, PMI on every heat.
| Grade 22 | Grade 23 / 24 | Grade 91 | |
|---|---|---|---|
| Creep strength | Baseline | Higher than 22 | Highest of the three |
| Fabrication demands | Straightforward | Moderate | Most demanding |
| Availability | Widely stocked | Uncommon, made to order | Well established |
| Chosen when | Duty is within its range | A specification names it | The design genuinely needs Grade 91 performance |
The honest caveat on availability. Grades 23 and 24 never achieved the market position of Grade 91, so the fabrication saving they offer comes with a sourcing penalty. In practice these grades are specified because a boiler licensor or project standard names them, rather than selected freely on their merits.
Chemical Composition
| Element | Range |
|---|---|
| Carbon | 0.04 - 0.10% |
| Manganese | 0.10 - 0.60% |
| Silicon | 0.50% max |
| Chromium | 1.90 - 2.60% |
| Molybdenum | 0.05 - 0.30% |
| Tungsten | 1.45 - 1.75% |
| Vanadium | 0.20 - 0.30% |
| Niobium | 0.02 - 0.08% |
| Boron | 0.0005 - 0.006% |
| Nitrogen | 0.030% max |
Where It Is Used
- Boiler tubes and headers, the application both grades were developed for.
- Superheater and reheater sections, where P22 lacks creep strength for the duty.
- Uprated plant, replacing P22 components on boilers pushed to higher conditions.
- Specification-driven supply, where a licensor or project standard names Grade 23.
Product Range and Supply
Supplied as buttweld fittings to ASME B16.9 and B16.28, NPS 1/2 inch to 48 inch, in schedules to XXS. Available as elbows, tees, reducers and caps.
Made to order. This grade is not held in stock. Expect a lead time and a minimum quantity, and send the governing specification with your enquiry so availability can be confirmed before you commit. EN 10204 3.1 certification is supplied as standard, with PMI, hardness testing and heat treatment records on request.
Frequently Asked Questions
WP23 is a tungsten-bearing 2.25Cr grade developed for boiler tubes and headers. It sits between P22 and P91, offering higher creep strength than 2.25Cr-1Mo while avoiding the narrow tempering windows and mandated welding consumables that make Grade 91 demanding. It is normally specified because a boiler licensor or project standard names it.
No. WP23 is uncommon and generally made to order rather than held in stock. Grades 23 and 24 never achieved the market position of Grade 91, so the fabrication advantage they offer comes with a sourcing penalty. Send the governing specification with your enquiry so availability and lead time can be confirmed.
Both fill the same gap between Grade 22 and Grade 91, by different chemistry. WP23 uses a tungsten addition to raise creep strength; WP24 uses vanadium with titanium and a controlled boron addition. The choice is normally dictated by the governing specification rather than by a free comparison.
If the specification names WP23, use it. If the design genuinely needs Grade 91 creep strength, use WP91, which is far better established and more readily available. WP23 is chosen where its intermediate position and easier fabrication suit the project, usually because a licensor specified it.
Enquire About This Grade
Send your fitting type, size, schedule and the governing specification, and we will confirm whether the grade can be sourced, with lead time and certification.