WH80 Steel Plate Applications & Ordering Guide
WH80 (Wuyang QT high-strength plate family; tables follow WH80Q) is specified for industrial fabrications where the drawing or material list names this grade. This applications page explains where the grade is used, what service conditions drive selection, and which certificate details belong on the purchase order. Gangsteel supplies WH80 (Wuyang QT high-strength plate family; tables follow WH80Q) with EN 10204 mill test certificates.
Typical Applications and Service Conditions
WH80 (Wuyang QT high-strength plate family; tables follow WH80Q) plate is ordered for pressure equipment, process vessels, heat-exchanger related fabrications, structural members under the governing code, and project packages that call the grade by name. Match the mill test certificate grade mark to the calculation sheet; do not treat near-equivalents as automatic substitutes.
Service drivers include the design temperature and pressure of the governing code (ASME, EN/PED, class society, or project specification), weld procedure qualification needs, toughness or creep allowables where applicable, and inspection scope. Delivery condition Q+T for C/D <=100 mm; >100-120 mm may be controlled-rolled + tempered; E max 60 mm Q+T should be stated explicitly on the purchase order.
Industry Use Cases
Pressure equipment and process: shells, heads, and related platework when drawings name WH80 (Wuyang QT high-strength plate family; tables follow WH80Q). Power and energy: boiler and heat-recovery fabrications under the ordered edition. Marine / offshore (when classed): only when the society material list names this exact grade stamp. Always keep heat-number traceability on cut pieces.
Chemical Composition - Supporting Data (WH80 (Wuyang QT high-strength plate family; tables follow WH80Q))
Heat analysis per WXG301-2008 Table 1 for WH80Q. Ceq limits by thickness (e.g. <=50 mm Ceq<=0.50). Confirm mill edition on MTC. Queue key WH80 is treated as the WH80Q WXG301 family unless the MTC names a different WH70/WH80 edition.
| Element / rule | Requirement |
|---|
| C, max | 0.18 |
| Si, max | 0.50 |
| Mn, max | 1.80 |
| P, max | 0.020 |
| S, max | 0.010 |
| Cr, max | 0.80 |
| Ni, max | 1.20 |
| Mo, max | 0.60 |
| Nb, max | 0.07 |
| V, max | 0.08 |
| Ti, max | 0.03 |
| B, max | 0.003 |
Mechanical Properties - Supporting Data (WH80 (Wuyang QT high-strength plate family; tables follow WH80Q))
Confirm thickness, specimen orientation, and any supplementary impact, UT, or hardness requirements on the PO.
| Property | Requirement |
|---|
| Yield Rp0.2, min (t<=50 mm) | 685 MPa |
| Yield Rp0.2, min (50 < t <=100 mm) | 665 MPa |
| Tensile Rm, min (t<=100 mm) | 760 MPa |
| Elongation A, min | 14% |
| Impact KV2 long. (quality D, -20 C) | 34 J min |
| Delivery / HT | Quenched and tempered (see WXG301 thickness rules) |
Related / Near-Equivalent Grades
Near-equivalents are for cross-reference only. They are not automatic code substitutes. Substitution requires engineer approval and matching certificate scope.
| System | Grade | Note |
|---|
| GB/T 16270 | Q690D / Q690E family | Nearest national QT HSLA family - not automatic substitute |
| EN 10025-6 | S690QL family | Approx. strength class - confirm |
| Mill | WQ690D | Related Wuyang QT designation |
Frequently Asked Questions
Where is WH80 (Wuyang QT high-strength plate family; tables follow WH80Q) typically applied?
WH80 (Wuyang QT high-strength plate family; tables follow WH80Q) is applied where design documents, class material lists, or purchaser specs name this grade for pressure, process, structural, or marine fabrications as applicable. Match the MTC marking to the drawing.
What service conditions drive selection of WH80 (Wuyang QT high-strength plate family; tables follow WH80Q)?
Design temperature and pressure, toughness or creep allowables, weldability, corrosion or process media, and the governing code edition drive selection. Delivery condition Q+T for C/D <=100 mm; >100-120 mm may be controlled-rolled + tempered; E max 60 mm Q+T must align with the ordered specification.
Can a near-equivalent replace WH80 (Wuyang QT high-strength plate family; tables follow WH80Q) on an applications drawing?
Not without redesign and written approval. Near-equivalents differ in chemistry, heat treatment, impact temperature, or product form. Commercial swaps create non-conformance when the dossier names WH80 (Wuyang QT high-strength plate family; tables follow WH80Q).
What fabrication notes matter for WH80 (Wuyang QT high-strength plate family; tables follow WH80Q)?
Use approved WPS/PQR packages for the thickness and filler, control heat input, and preserve heat-number traceability on cut pieces. State any supplementary UT, PMI, or impact tests on the purchase order.
What certificate and marking should an applications PO demand?
EN 10204 3.1 is standard; 3.2 when a purchaser-appointed inspector witnesses tests. The MTC should show heat analysis, tensile results, delivery condition, and heat number aligned with WH80 (Wuyang QT high-strength plate family; tables follow WH80Q).
How should I RFQ WH80 (Wuyang QT high-strength plate family; tables follow WH80Q) plate from Gangsteel for a project?
Send WH80 (Wuyang QT high-strength plate family; tables follow WH80Q), thickness x width x length (or nesting list), quantity, delivery condition, optional NDT/PMI, certificate type, destination, and any dual-mark needs. Note the end use when special flatness or cut-to-size packaging is required.
Ordering and Mill Certificates
State grade WH80 (Wuyang QT high-strength plate family; tables follow WH80Q), dimensions, quantity, delivery condition, optional NDT/PMI, and certificate (EN 10204 3.1 standard; 3.2 when third-party inspection is ordered). Gangsteel supplies export plate and related products with mill test certificates. Contact Gangsteel for stock and mill production RFQs.
