ASTM A573GR58|A573 Grade 58 steel plate supplier

Order the structural material, not an isolated strength number

ASTM A573 Grade 58 is structural-quality carbon-manganese-silicon plate for applications where improved notch toughness matters. The official A573/A573M-25 title is Structural Carbon Steel Plates; the public abstract describes fine-grain practice. Its structural A6/A6M requirements basis differs from vessel-plate specifications. Grade 58 is not a low-alloy classification, nor does a nearby strength number identify an equivalent material.

The public Scope limits plate to 1.5 in. [40 mm]. Treat that as an early material-selection check, before requesting a price or reviewing a test report. Inch-pound and SI are independent systems, not interchangeable conversions. Tell Gangsteel which system and edition govern the order, together with the actual thickness, width, length and quantity. A size request outside the scope needs a resolved material specification rather than extrapolated Grade 58 properties.

Grade 58 chemistry keeps the same carbon maximum in both bands

The following is a single-compilation public reference from the Grade 58 column of Ferrobend’s A573 main table, which does not identify an ASTM year. It is not an official chemistry-table extract or a producer-certified composition. The entries are heat-style references; no product-analysis column is established here. In particular, use the Grade 58 carbon, manganese and silicon entries together, rather than assemble a chemistry row from other A573 grades.

The two carbon rows preserve the reference’s thickness structure without implying a step-up in carbon at 13 mm. The 0.030% phosphorus and sulfur maxima have the same single-compilation limitation as the other chemistry values; they are not confirmed official limits for a named current edition. For product analysis, establish the applicable sampling and tolerance provisions from the ordered requirements instead of copying the heat-style limits into a second column.

Ferrobend main-table footnote A also describes a conditional carbon–manganese allowance. Each 0.01 percentage-point reduction below the carbon maximum permits a 0.06 percentage-point increase above the manganese maximum, to a 1.50% ceiling for Grades 58 and 65. This is a shared, single-compilation reference, not a Grade 58-only rule or an unconditional manganese range. Its applicability must be checked against the ordered edition before a result is accepted.

Separate the tensile class, yield minimum and elongation gauges

These mechanical figures also rest on Ferrobend’s main-table Grade 58 column alone, not on an independently confirmed mill table. The official public Scope does not itself publish the Grade 58 numerical mechanical requirements. Retain the specimen basis and Ferrobend footnotes B/C, with the applicable A6-style adjustments, when preparing an inspection checklist. The ordered specification and actual material report govern acceptance.

A report showing “24% elongation” without its gauge leaves an important question unanswered. Likewise, the Grade 58 designation must not be read as a 58 ksi yield minimum. Keep the property names, units and test basis attached to the numbers. Do not extend this mechanical reference into an additional thickness band beyond the public-Scope limit.

Translate the toughness requirement into a test instruction

Improved notch toughness is a material-selection purpose, not a measured Charpy result. For a project that requires impact testing, specify the test method, specimen, orientation, temperature, acceptance values and reporting arrangements. Agree those requirements during quotation review so that the proposed supply and the inspection plan address the same service need. There is no default impact energy or longitudinal test direction stated here.

Fine-grain practice also does not establish a mandatory delivered heat-treatment condition. State the required condition and request identification of the actual condition in the material records. Any welding procedure or subsequent fabrication treatment must be suitable for the component and project requirements. This reference does not provide a preheat value, welding setting or normalizing temperature.

Make the Grade 58 enquiry and certificate describe the same plate

Keep optional examinations distinct from the basic material description. If ultrasonic examination or other supplementary work is needed, describe its extent and acceptance basis rather than assume it is included. A certificate title alone does not show that every purchasing condition was tested. Review traceability and the required results together; do not infer inventory, immediate availability or a particular inspection approval from a product name.

Related structural choices are not substitution approvals

Other strength levels in the family include ASTM A573 Grade 65 plate and ASTM A573 Grade 70 plate. They have their own chemistry and mechanical requirements. Use those pages for related material choices, not to determine Grade 58 numerical limits. A higher-strength name does not automatically authorize a replacement for the material selected on a drawing.

General structural carbon plate and vessel plate also serve different specification purposes. The SA-516 versus A36 comparison provides context for that distinction; it is neither an A573 acceptance table nor a declaration that A573, A283, A36 and vessel grades are equivalent. Resolve a proposed alternative with the responsible technical authority before changing the purchasing designation.

Questions about the Grade 58 purchasing basis

Does the number 58 identify the yield strength?

No. The public-reference tensile range begins at 58 ksi [400 MPa], while the separate yield reference is 32 ksi [220 MPa]. The full A573 designation, grade and edition remain necessary. A single strength headline does not describe the chemistry, structural scope or required test basis.

Should carbon increase when Grade 58 plate exceeds 13 mm?

Not in the cited main-table Grade 58 reference. Carbon remains 0.23% maximum in both listed bands within the 1.5 in. [40 mm] scope. Keep that Grade 58 provision separate from other A573 grades, rather than import a carbon step simply because another grade has one.

Is manganese above 0.90% automatically acceptable if carbon is lower?

No. Ferrobend’s main-table footnote describes a conditional 0.01 carbon / 0.06 manganese allowance with a 1.50% ceiling shared by Grades 58 and 65. This is a single-compilation reference. Establish applicability under the ordered requirements and the analysis basis before using it to judge an actual result.

How should an ambient-service toughness requirement be requested?

State the actual service-related test and acceptance requirements in the enquiry. The improved-toughness purpose and fine-grain practice do not establish a universal impact temperature, energy or direction. The quotation and subsequent report should identify the agreed test conditions, rather than rely on a general toughness description.

Are 21% and 24% two thickness-dependent elongation limits?

They are gauge-dependent references: 21% in 8 in. [200 mm] and 24% in 2 in. [50 mm]. The applicable specimen and adjustment provisions matter. Ask for the gauge and test basis on the report; do not choose one percentage solely from the plate thickness.