ASTM A203 Steel Plate
GradeD STEEL PLATE Steel Plate Specifications
ASTM A203 / A203M Grade D (ASME SA203 Grade D) [queue key GradeD] is a nickel alloy steel pressure-vessel plate grade under ASTM A203/A203M; ASME SA203. 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 A203 / A203M Grade D (ASME SA203 Grade D) [queue key GradeD] is supplied for projects that name this designation on the purchase order or calculation sheet. Standard delivery condition is Normalized (Grades A/B/D/E); Grade F quenched and tempered per A203. 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 A203 / A203M Grade D (ASME SA203 Grade D) [queue key GradeD])
Heat analysis for Grade D. Product analysis Ni tolerances apply per A203/A203M. Modern editions list P/S 0.025 max. 3.5% Ni family; thickness over 100 mm not listed for Grade D in common tables. Queue key GradeD maps to product/.../ASTM/A203/GradeD pages.
| Element / rule | Requirement |
|---|---|
| C, max (t<=50 mm) | 0.17 |
| C, max (50 < t <= 100 mm) | 0.20 |
| Mn, max (heat, t<=50 mm) | 0.70 |
| Mn, max (heat, t>50 mm) | 0.80 |
| P, max | 0.025 |
| S, max | 0.025 |
| Si (heat) | 0.15-0.40 |
| Ni (heat) | 3.25-3.75 |
Mechanical Properties (ASTM A203 / A203M Grade D (ASME SA203 Grade D) [queue key GradeD])
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 | 37 ksi [255 MPa] |
| Elongation in 200 mm, min | 19% |
| Elongation in 50 mm, min | 23% |
| Delivery / HT | Per A203/A203M for the ordered grade |
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 | SA203 Grade D | ASME twin |
| ASTM | A203 sister grades | A/B = 2.25% Ni; D/E/F = 3.5% Ni family |
Frequently Asked Questions
What is ASTM A203 / A203M Grade D (ASME SA203 Grade D) [queue key GradeD]?
ASTM A203 / A203M Grade D (ASME SA203 Grade D) [queue key GradeD] is a nickel alloy steel pressure-vessel plate under ASTM A203/A203M; ASME SA203. It is ordered when drawings or the calculation sheet name this designation specifically.
What chemical composition applies to ASTM A203 / A203M Grade D (ASME SA203 Grade D) [queue key GradeD]?
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 A203 / A203M Grade D (ASME SA203 Grade D) [queue key GradeD]?
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 A203 / A203M Grade D (ASME SA203 Grade D) [queue key GradeD]?
Standard delivery is Normalized (Grades A/B/D/E); Grade F quenched and tempered per A203. State it explicitly on the PO. Do not accept an alternate route without a written concession.
How does ASTM A203 / A203M Grade D (ASME SA203 Grade D) [queue key GradeD] 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 A203 / A203M Grade D (ASME SA203 Grade D) [queue key GradeD] from Gangsteel?
Send ASTM A203 / A203M Grade D (ASME SA203 Grade D) [queue key GradeD], 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 A203 / A203M Grade D (ASME SA203 Grade D) [queue key GradeD], 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.