SA516GR.55 NACE Steel Plate Specifications

ASTM A516 / A516M Grade 55 (ASME SA516 Grade 55) with NACE / sour-service options as ordered is a carbon steel pressure-vessel plate for moderate- and lower-temperature service grade under ASTM A516/A516M; ASME SA516. 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 A516 / A516M Grade 55 (ASME SA516 Grade 55) with NACE / sour-service options as ordered is supplied for projects that name this designation on the purchase order or calculation sheet. Standard delivery condition is Normalized for t>40 mm typical; 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 A516 / A516M Grade 55 (ASME SA516 Grade 55) with NACE / sour-service options as ordered)

Heat analysis for Grade 55. Carbon max rises with thickness per A516 Table 1 (confirm ordered thickness band). For each 0.01 below C max, Mn max may rise 0.06 up to 1.50 heat. Grade 60 t<=12.5 mm may use Mn 0.60-0.90. NACE MR0175/ISO 15156 hardness, HIC/SSC or other sour extras are purchaser requirements - confirm on the PO/MTC; base plate chemistry remains A516/SA516.

Element / rule	Requirement
C, max (t<=12.5 mm)	0.18
Mn (heat, t>12.5 mm typical)	0.60-1.20
P, max	0.025
S, max	0.025
Si (heat)	0.15-0.40

Mechanical Properties (ASTM A516 / A516M Grade 55 (ASME SA516 Grade 55) with NACE / sour-service options as ordered)

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

Property	Requirement
Tensile strength	55-75 ksi [380-515 MPa]
Yield strength, min	30 ksi [205 MPa]
Elongation in 200 mm, min	23%
Elongation in 50 mm, min	27%
Delivery / grain	Killed; fine austenitic grain; normalize when required by thickness

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	SA516 Grade 55	ASME twin
EN 10028-2/3	P265GH / P355NH family (approx.)	Not drop-in - confirm design code
Related	A515 same strength ladder	Higher-temperature sister spec
Sour service	NACE / HIC / SSC options	Confirm test methods and acceptance on order

Frequently Asked Questions

What is ASTM A516 / A516M Grade 55 (ASME SA516 Grade 55) with NACE / sour-service options as ordered?

ASTM A516 / A516M Grade 55 (ASME SA516 Grade 55) with NACE / sour-service options as ordered is a carbon steel pressure-vessel plate for moderate- and lower-temperature service under ASTM A516/A516M; ASME SA516. It is ordered when drawings or the calculation sheet name this designation specifically.

What chemical composition applies to ASTM A516 / A516M Grade 55 (ASME SA516 Grade 55) with NACE / sour-service options as ordered?

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 A516 / A516M Grade 55 (ASME SA516 Grade 55) with NACE / sour-service options as ordered?

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 A516 / A516M Grade 55 (ASME SA516 Grade 55) with NACE / sour-service options as ordered?

Standard delivery is Normalized for t>40 mm typical; killed, fine austenitic grain size. State it explicitly on the PO. Do not accept an alternate route without a written concession.

How does ASTM A516 / A516M Grade 55 (ASME SA516 Grade 55) with NACE / sour-service options as ordered 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 A516 / A516M Grade 55 (ASME SA516 Grade 55) with NACE / sour-service options as ordered from Gangsteel?

Send ASTM A516 / A516M Grade 55 (ASME SA516 Grade 55) with NACE / sour-service options as ordered, 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 A516 / A516M Grade 55 (ASME SA516 Grade 55) with NACE / sour-service options as ordered, 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.