BHW35 Equivalents & Cross-Reference

BHW35 / 13MnNiMo5-4 (DIWA 353 family) 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
EN / Dil	13MnNiMo5-4 / DIWA 353	Common European mill mapping
GB	13MnNiMoR family	Chinese pressure-vessel naming - confirm edition
Related	15NiCuMoNb5-6-4 / WB36	Different Ni-Cu-Mo-Nb boiler family - not interchangeable

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 (BHW35 / 13MnNiMo5-4 (DIWA 353 family))

BHW35 is a Chinese boiler-plate trade/mill grade commonly mapped to 13MnNiMo5-4 / DIWA 353. Confirm the ordered mill specification and MTC analysis - do not treat the trade name alone as a design code.

Element / rule	Requirement
C, max	0.15 (heat; product often <=0.17)
Si	0.10-0.50
Mn	1.00-1.60
P, max	0.020
S, max	0.010
Ni	0.60-1.00
Mo	0.20-0.40
Cr	0.20-0.40
Nb, max	0.020
Al total, min	0.015

Mechanical Properties (BHW35 / 13MnNiMo5-4 (DIWA 353 family))

Confirm thickness, specimen orientation, and any supplementary impact, UT, or hardness requirements on the PO.

Property	Requirement
Yield min (t<=50 mm typical)	400 MPa
Yield min (50 < t <= 100 mm typical)	390 MPa
Tensile Rm (typical N+T)	570-740 MPa
Elongation A, min (typical)	18%
Delivery	Normalized and tempered

Frequently Asked Questions

What are the common equivalents for BHW35 / 13MnNiMo5-4 (DIWA 353 family)?

Buyers typically cross-reference BHW35 / 13MnNiMo5-4 (DIWA 353 family) 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 BHW35 / 13MnNiMo5-4 (DIWA 353 family)?

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 BHW35 / 13MnNiMo5-4 (DIWA 353 family) 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 BHW35 / 13MnNiMo5-4 (DIWA 353 family) when equivalents are also named?

State BHW35 / 13MnNiMo5-4 (DIWA 353 family) 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 BHW35 / 13MnNiMo5-4 (DIWA 353 family), 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.