ASTM A515 Grade 60

Overview

Designation system

ASTM grade designation based on the minimum tensile-strength level; Grade 60 corresponds to Grade 415 in SI designation

Product forms

Hot-rolled pressure-vessel plate, Finished plate processed from coil

Condition

As-rolled, normally for thickness 50 mm [2 in.] and under, Normalized, Stress relieved, Normalized and stress relieved

Density

7850 kg/m³ (Representative density for carbon steel, useful for estimating mass; not a specified A515/A515M acceptance requirement.)

What the designation controls

A515/A515M is a plate product specification, not a general-purpose chemistry designation. Grade 60 identifies the lowest-strength grade in the current A515 series and denotes a specified tensile-strength range of 60–80 ksi; the corresponding SI grade designation is Grade 415. Compliance requires both A515/A515M and the applicable general requirements of ASTM A20/A20M. A20/A20M supplies the common rules for ordering, testing and retesting, dimensional tolerances, surface quality, defect repair, marking, certification, and plate processed from coil.

The ASTM designation applies specifically to pressure-vessel plate. It does not define pipe, forgings, castings, bar, or structural shapes of the same chemistry. Coil is not qualified directly as A515 material; it becomes eligible only after processing into finished plates, including leveling, cutting, testing, inspection, any required heat treatment, marking, and certification.

For ASME Code construction, specify the Code-adopted material as SA-515/SA-515M and use the edition/addenda accepted by the governing construction code and jurisdiction. An ASTM A515 certificate should not automatically be assumed to satisfy every ASME material-documentation requirement.

Chemical requirements and metallurgical character

For each 0.01 percentage-point reduction below the applicable maximum carbon content, the specification permits manganese to exceed its basic maximum by 0.06 percentage point, up to 1.50% by heat analysis or 1.60% by product analysis. Consequently, the simple 0.90% manganese figure is not an absolute ceiling for every conforming heat.

The steel must be killed and produced to coarse austenitic grain-size practice. This combination reflects the grade's historical elevated-temperature pressure-vessel role. The specification does not set a carbon-equivalent limit and does not comprehensively limit residual elements such as copper, nickel, chromium, or molybdenum. Actual heat chemistry therefore matters when assessing weldability, heat treatment response, and project-specific residual-element restrictions.

Delivery condition and thickness effects

Thickness influences more than delivery condition. The permitted maximum carbon increases with thickness, which assists strength development through the plate section but can increase hardenability and welding sensitivity. Thick normalized plate should therefore not be assumed to have the same fabrication behavior as thin as-rolled plate even though both carry the same grade designation.

Where fabrication will include substantial post-weld heat treatment, consider ordering simulated-PWHT testing under ASTM A20/A20M Supplementary Requirement S3. This tests representative coupons after the specified thermal simulation rather than relying only on properties in the original delivery condition.

Room-temperature mechanical requirements

These are specification acceptance limits, not typical design properties. The upper tensile limit is important because excessive strength may indicate chemistry or processing that is undesirable for forming or welding. Conversely, the 220 MPa yield value is a room-temperature material minimum and must not be substituted directly for a pressure-vessel design allowable stress.

Design stresses at temperature must come from the applicable construction code, material condition, thickness range, Code edition, and service temperature. ASTM A515/A515M itself supplies neither a universal allowable-stress table nor a universal maximum operating temperature.

Toughness and temperature suitability

The base A515 Grade 60 specification contains no mandatory Charpy V-notch impact-energy requirement. Its coarse-grain practice and elevated-temperature design intent mean that low-temperature toughness must never be inferred from the designation or from satisfactory tensile results. Minimum design metal temperature, governing Code exemptions, heat-treatment condition, thickness, weld procedure, and required impact-test temperature and energy must be evaluated separately.

The phrase “intermediate- and higher-temperature service” describes the intended application class, not immunity to creep, graphitization, oxidation, corrosion, thermal fatigue, or loss of strength. The governing design code and service assessment must establish allowable stress and temperature limits. A515 is a plain carbon-silicon steel and does not provide the elevated-temperature strength or oxidation resistance of chromium-molybdenum alloy steels.

Welding and forming implications

A515 Grade 60 is conventionally weldable using qualified carbon-steel procedures, but weldability varies with thickness and actual heat chemistry. The permitted carbon level rises to 0.31% in thick plate, and the manganese substitution rule can produce manganese contents well above the basic 0.90% heat-analysis maximum. Preheat, interpass temperature, heat input, hydrogen control, consumable selection, and post-weld heat treatment should therefore be established from the actual material certificate, joint thickness and restraint, welding process, required toughness, and governing construction code—not from the grade name alone.

Under ASME Section IX, A/SA-515 Grade 60 is assigned P-No. 1, Group No. 1. This facilitates procedure qualification within the ASME grouping system but does not establish a welding procedure, waive impact-test qualification variables, or authorize substitution for every other P-No. 1 material.

The grade can be hot or cold formed using pressure-vessel fabrication practice, but forming strain, plate thickness, initial condition, and subsequent thermal cycles can change strength and toughness. The fabrication code should be checked for requirements governing heat treatment after forming. If plate is to be normalized after fabrication rather than by the mill, the purchase documents and mechanical-test condition must clearly represent the intended final treatment.

A515 Grade 60 versus A516 Grade 60

A516 Grade 60 is often encountered more frequently in modern welded pressure vessels because of its fine-grain and toughness-oriented specification framework. That commercial prevalence is not a technical basis for replacing an explicitly specified A515 Grade 60 plate, or vice versa, without engineering and Code approval.

Specifying and verifying a purchase

On receipt, confirm that the certificate matches the plate markings and purchase order, that the reported heat treatment is permitted for the actual thickness, and that all invoked supplementary tests were performed in the required condition. Do not accept generic catalogue values in place of heat- and plate-specific certification.

Related designations

A related designation or cross-standard counterpart is not a declaration of equivalence; confirm the standard, product form and condition before substituting.