WQ690D WH80Q Steel Plate Applications & Ordering Guide
WQ690D / WH80Q (Wuyang QT high-strength plate) 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 WQ690D / WH80Q (Wuyang QT high-strength plate) with EN 10204 mill test certificates.
Typical Applications and Service Conditions
WQ690D / WH80Q (Wuyang QT high-strength plate) 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 WQ690D / WH80Q (Wuyang QT high-strength plate). 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 (WQ690D / WH80Q (Wuyang QT high-strength plate))
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 WQ690D-WH80Q dual-names the Wuyang QT family; tabulated values are WH80Q / WXG301.
| 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 (WQ690D / WH80Q (Wuyang QT high-strength plate))
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 WQ690D / WH80Q (Wuyang QT high-strength plate) typically applied?
WQ690D / WH80Q (Wuyang QT high-strength plate) 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 WQ690D / WH80Q (Wuyang QT high-strength plate)?
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 WQ690D / WH80Q (Wuyang QT high-strength plate) 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 WQ690D / WH80Q (Wuyang QT high-strength plate).
What fabrication notes matter for WQ690D / WH80Q (Wuyang QT high-strength plate)?
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 WQ690D / WH80Q (Wuyang QT high-strength plate).
How should I RFQ WQ690D / WH80Q (Wuyang QT high-strength plate) plate from Gangsteel for a project?
Send WQ690D / WH80Q (Wuyang QT high-strength plate), 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 WQ690D / WH80Q (Wuyang QT high-strength plate), 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.
