A662 Grade B Steel Plate Applications & Ordering Guide

ASTM A662 / A662M Grade B 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 ASTM A662 / A662M Grade B with EN 10204 mill test certificates.

This page is a standalone technical article. For the primary overview on the original URL, see ASTM A662 / A662M Grade B primary specification page.

Typical Applications and Service Conditions

ASTM A662 / A662M Grade B 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 Normalized when t>40 mm [1.5 in]; thinner plate as-rolled or normalized per order should be stated explicitly on the purchase order.

Industry Use Cases

Pressure equipment and process: shells, heads, and related platework when drawings name ASTM A662 / A662M Grade B. 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 (ASTM A662 / A662M Grade B)

Heat and product analysis limits per A662/A662M Grade B.

Element	Heat analysis %	Product analysis %
C, max	0.19	0.22
Mn	0.85-1.50	0.79-1.62
P, max	0.025	0.025
S, max	0.025	0.025
Si	0.15-0.40	0.13-0.45

Mechanical Properties - Supporting Data (ASTM A662 / A662M Grade B)

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

Property	Requirement
Tensile strength	65-85 ksi [450-585 MPa]
Yield strength, min	40 ksi [275 MPa]
Elongation in 200 mm, min	20%
Elongation in 50 mm, min	23%
Delivery condition	Normalized when t>40 mm; thinner AR or N per PO

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
ASTM	A662 Grade A / C	Same family; A lower / C higher tensile
ASTM	A516 Grade 65/70	Common PV carbon plate - not automatic substitute
EN	P355NH (approx.)	Confirm impact and code

Frequently Asked Questions

Where is ASTM A662 / A662M Grade B typically applied?

ASTM A662 / A662M Grade B 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. Primary overview: ASTM A662 / A662M Grade B.

What service conditions drive selection of ASTM A662 / A662M Grade B?

Design temperature and pressure, toughness or creep allowables, weldability, corrosion or process media, and the governing code edition drive selection. Delivery condition Normalized when t>40 mm [1.5 in]; thinner plate as-rolled or normalized per order must align with the ordered specification.

Can a near-equivalent replace ASTM A662 / A662M Grade B 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 ASTM A662 / A662M Grade B.

What fabrication notes matter for ASTM A662 / A662M Grade B?

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 ASTM A662 / A662M Grade B.

How should I RFQ ASTM A662 / A662M Grade B plate from Gangsteel for a project?

Send ASTM A662 / A662M Grade B, 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 ASTM A662 / A662M Grade B, 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.