SA533 3 Steel Plate Specifications

ASTM A533 / ASME SA533 Class 3 [queue key SA533-3] is a quenched-and-tempered manganese-molybdenum / manganese-molybdenum-nickel pressure-vessel plate grade under ASTM A533/A533M; ASME SA533. This specification page covers grade identity, chemistry, mechanical requirements, related grades, and RFQ practice. Accept material against the ordered edition and the mill test certificate.

Grade Identity and Delivery Condition

ASTM A533 / ASME SA533 Class 3 [queue key SA533-3] is supplied for projects that name this designation on the purchase order or calculation sheet. Standard delivery condition is Quenched and tempered; killed; fine austenitic grain size. Gangsteel supplies export plate and related products with EN 10204 documentation. Do not accept an alternate heat-treatment route unless a written concession changes the specification requirement.

Chemical Composition - Heat Analysis (ASTM A533 / ASME SA533 Class 3 [queue key SA533-3])

Heat/product analysis for A533 Types A-D. Class 3 is a STRENGTH class; chemistry Type (A/B/C/D/E) must be stated on the PO/MTC. Type E has different Mn/Mo/Ni/Cr/P/S windows - do not use Types A-D chem for Type E. For Class 2/3 with S3 long temper, Mn heat max may rise to 1.60% (product 1.65%). Confirm ordered edition. Queue alias SA533-3 -> SA533 Class 3. Confirm Type A/B/C/D/E on PO/MTC.

Element / rule	Requirement
C, max (Types A-D)	0.25
Mn, heat (Types A-D)	1.15-1.50
Mn, product (Types A-D)	1.07-1.62
P, max	0.025
S, max	0.025
Si, heat	0.15-0.40
Si, product	0.13-0.45
Mo, heat	0.45-0.60
Mo, product	0.41-0.64
Ni, heat Type A	not specified
Ni, heat Type B	0.40-0.70
Ni, heat Type C	0.70-1.00
Ni, heat Type D	0.20-0.40

Mechanical Properties (ASTM A533 / ASME SA533 Class 3 [queue key SA533-3])

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

Property	Requirement
Tensile strength	100-125 ksi [690-860 MPa]
Yield strength, min	83 ksi [570 MPa]
Elongation in 50 mm, min	16%
Delivery / HT	Quenched and tempered

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
ASME	SA533 Class 3	ASME twin
ASTM Types	A/B/C/D/E	Type = chemistry family; Class = strength
Related	A302 / A533 lineage	QT Mn-Mo PV family

Frequently Asked Questions

What is ASTM A533 / ASME SA533 Class 3 [queue key SA533-3]?

ASTM A533 / ASME SA533 Class 3 [queue key SA533-3] is a quenched-and-tempered manganese-molybdenum / manganese-molybdenum-nickel pressure-vessel plate under ASTM A533/A533M; ASME SA533. It is ordered when drawings or the calculation sheet name this designation specifically.

What chemical composition applies to ASTM A533 / ASME SA533 Class 3 [queue key SA533-3]?

Controlled elements and limits are tabulated above from the governing standard. Always verify the heat analysis on the MTC against the ordered edition.

What mechanical properties should buyers expect for ASTM A533 / ASME SA533 Class 3 [queue key SA533-3]?

Tensile, yield, elongation, and related limits are tabulated above. Design allowables must come from the applicable pressure-vessel or structural code, not from a web summary.

What delivery condition is required for ASTM A533 / ASME SA533 Class 3 [queue key SA533-3]?

Standard delivery is Quenched and tempered; killed; fine austenitic grain size. State it explicitly on the PO. Do not accept an alternate route without a written concession.

How does ASTM A533 / ASME SA533 Class 3 [queue key SA533-3] differ from near-equivalent grades?

Near-equivalents may differ in carbon or alloy bands, tensile class, impact temperature, or heat treatment. Substitution needs engineering approval and matching certificate scope.

How do I RFQ ASTM A533 / ASME SA533 Class 3 [queue key SA533-3] from Gangsteel?

Send ASTM A533 / ASME SA533 Class 3 [queue key SA533-3], thickness x width x length, quantity or tonnage, delivery condition, optional impact/UT/Z tests, EN 10204 3.1 or 3.2, destination, and any dual-mark needs. Gangsteel replies with mill options, lead time, and packing notes.

Ordering and Mill Certificates

State grade ASTM A533 / ASME SA533 Class 3 [queue key SA533-3], 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.