WH80Q Equivalents & Cross-Reference

WH80Q (Wuyang / Wugang quenched-and-tempered high-strength plate) is frequently cross-referenced to related ASTM/ASME, EN, and other designations. This equivalents page leads with that cross-reference map, then summarizes chemistry and mechanical limits used to judge dual marking. Near-equivalents are not automatic code substitutes.

Equivalents and Cross-Reference Map

Use the table for RFQ orientation and dual-cert discussions. True dual certification exists only when one heat meets every chemical and mechanical limit of each named specification on the same MTC. Class society, PED, or ASME dossier wording still controls acceptance.

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

Substitution caveat: Do not swap grades based on marketing strength bands alone. Chemistry, heat treatment, impact temperature, and product form must be reviewed by the responsible engineer before any concession.

Chemical Composition - Base Grade (WH80Q (Wuyang / Wugang quenched-and-tempered 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.

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 (WH80Q (Wuyang / Wugang quenched-and-tempered 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)

Frequently Asked Questions

What are the common equivalents for WH80Q (Wuyang / Wugang quenched-and-tempered high-strength plate)?

Buyers typically cross-reference WH80Q (Wuyang / Wugang quenched-and-tempered high-strength plate) with the related designations listed in the map above. Related grades in the same family are not automatic substitutes.

Is a near-equivalent always acceptable on an ASME or PED dossier?

No. The material specification listed on the calculation sheet, PED appraisal, or purchaser material list controls acceptance. Certificate marks must match unless a formal concession is approved.

How should dual marking be requested for WH80Q (Wuyang / Wugang quenched-and-tempered high-strength plate)?

List every required standard on the purchase order and ask the mill to print all approved designations on one MTC only when the heat qualifies against each. Gangsteel confirms which heats can honestly carry those marks before allocation.

What is a safe way to compare WH80Q (Wuyang / Wugang quenched-and-tempered high-strength plate) with near-equivalents?

Compare chemistry ranges, tensile/yield windows, impact temperature if specified, delivery/heat-treatment practice, and product form side by side. Name-alike grades can still fail dossier acceptance.

Does a sibling class or grade count as an equivalent?

Sibling classes (for example Class 1 vs Class 2, or Grade A vs B) share a family but intentionally different strength or toughness tiers. Ordering the wrong tier undercuts the design assumption.

How do I RFQ WH80Q (Wuyang / Wugang quenched-and-tempered high-strength plate) when equivalents are also named?

State WH80Q (Wuyang / Wugang quenched-and-tempered high-strength plate) as the governing grade, then list any dual marks required. Include dimensions, quantity, delivery condition, optional tests, certificate type, destination, and which mark governs acceptance.

Ordering and Mill Certificates

State grade WH80Q (Wuyang / Wugang quenched-and-tempered 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.