TECHNICAL REFERENCE & SELECTION GUIDE
ASTM / ASME Steel Grade Reference & Selection Guide
A comprehensive engineering and procurement guide to ASTM and ASME steel material specifications. Compare structural steels, pressure vessel and boiler plates, alloy steels, and industrial piping standards. Megato Group supplies certified carbon, alloy, and pressure-grade steels fully compliant with ASTM specifications and ASME Boiler & Pressure Vessel Code (BPVC) requirements.
Quick Section Jump: ASTM vs ASME Explained · Pressure Vessel (A516/SA516) · Structural (A36, A572) · Pipes (A106, A335) · Quality & MTC 3.1 · Engineering FAQs
ASTM vs ASME Steel Standards: What Is the Difference?
In international steel procurement and engineering design, ASTM and ASME designations are frequently encountered together. While closely linked, they serve distinct regulatory functions and cannot always be considered unconditionally interchangeable.
ASTM (Material Specifications)
ASTM International develops voluntary consensus technical standards focusing on raw material parameters, manufacturing procedures, chemical composition tolerances, mechanical property limits, and standard metallurgical testing methods. For ferrous materials, ASTM uses the “A” prefix (e.g., ASTM A36 or ASTM A516).
ASME (Equipment Design & Codes)
ASME (American Society of Mechanical Engineers) establishes legally binding construction codes for mechanical systems, pressurized equipment, and nuclear facilities. Within the ASME Boiler and Pressure Vessel Code (BPVC) Section II Part A, ferrous materials are assigned the “SA” designation (e.g., ASME SA516).
Engineering Distinction (ASTM A516 vs. ASME SA516):
SA516 is an ASME material specification designation adopted directly into the ASME Code framework. While generally identical or equivalent with acceptable modifications to ASTM A516, the applicable specification must always be confirmed against the governing project design code, edition year, and purchase order requirements. Where required, Megato Group supplies dual-certified ASTM/ASME plates meeting both specifications simultaneously.
ASTM & ASME Steel Grades by Material Category
To help engineers and procurement teams locate the correct material quickly, our steel portfolio is categorized according to operational performance and primary fabrication form.
1. Pressure Vessel & Boiler Steel
Engineered for pressurized reactors, steam boilers, gas storage vessels, separators, and heat exchangers requiring superior notch toughness, crack resistance, and creep strength under thermal loads.
- ASTM A516 / SA516 (Grades 55, 60, 65, 70): Benchmark for moderate- and low-temperature service.
- ASTM A537 / SA537 (Class 1 & Class 2): Heat-treated C-Mn-Si steel for higher yield strength.
- ASTM A387 / SA387 (Grades 11, 22, 91): Chromium-molybdenum alloy plates for high-temperature service.
- ASTM A285 (Grades A, B, C): Low-to-intermediate tensile strength for stationary storage tanks.
Direct Link: Explore our Pressure Vessel Steel Plates or read our guide on ASTM A516 Grade 70 Steel Plate.
2. Carbon Structural & HSLA Steel
Developed for load-bearing frameworks, bridges, transmission towers, high-rise buildings, and machinery bases where weldability, strength-to-weight ratio, and ductility are crucial.
- ASTM A36 / SA36: Universal structural carbon steel for welded, bolted, and riveted construction.
- ASTM A572 / SA572 (Grades 42, 50, 60, 65): High-strength low-alloy (HSLA) columbium-vanadium steel.
- ASTM A588 / SA588 (Grade A, B): Atmospheric corrosion-resistant weathering steel.
- ASTM A709: Dedicated structural specification covering highway and railway bridge plates.
Direct Link: View dimensions on our Structural Steel and learn about ASTM A36 Steel Plates.
3. Industrial Steel Pipes & Tubulars
Seamless and welded tubular specifications tailored for fluid transport, high-temperature utility lines, cryogenic systems, and cross-country energy conveyance.
- ASTM A106 / SA106 (Grade B & C): Seamless carbon steel pipe for high-temperature service.
- ASTM A53 / SA53 (Type E, F, S): General-purpose black and galvanized pipe for pressure applications.
- ASTM A333 / SA333 (Grade 6): Low-temperature seamless and welded pipe down to -46°C.
- ASTM A335 / SA335 (P11, P22, P91): Ferritic alloy seamless pipes with high creep-rupture performance.
Direct Link: Browse our complete range of Seamless & Welded Steel Pipes.
ASTM / ASME Steel Grade Technical Comparison Chart
Use the technical reference table below to compare minimum mechanical values, common delivery forms, and primary industrial applications across our core ASTM / ASME portfolio.
| ASTM Grade | ASME Spec | Min. Yield (MPa / ksi) | Tensile Range (MPa) | Primary Form | Target Applications | Product Link |
|---|---|---|---|---|---|---|
| A36 | SA36 | 250 MPa (36 ksi) | 400 – 550 | Plate, Bar, Section | Structural frames, civil works | A36 Plate |
| A516 Gr. 70 | SA516 Gr. 70 | 260 MPa (38 ksi) | 485 – 620 | Heavy Plate | Boilers, pressure vessels, tanks | A516 Gr. 70 |
| A572 Gr. 50 | SA572 Gr. 50 | 345 MPa (50 ksi) | 450 min. | Plate, Shapes | Bridges, heavy industrial structures | A572 Gr. 50 |
| A537 Cl. 1 | SA537 Cl. 1 | 345 MPa (50 ksi) | 485 – 620 | Normalized Plate | Pressurized gas spheres, storage drums | A537 Plate |
| A387 Gr. 11 | SA387 Gr. 11 | 310 MPa (45 ksi) | 515 – 690 | Alloy Heavy Plate | High-temp petrochemical reactors | A387 Plate |
| A106 Gr. B | SA106 Gr. B | 240 MPa (35 ksi) | 415 min. | Seamless Pipe | High-temp process fluid piping | A106 Pipe |
*Note: Mechanical properties vary according to plate thickness, heat treatment, and Supplementary Requirements (SR). Always refer to current mill test certificates and project requirements.
Delivery Conditions and Processing Capabilities
Megato Group supplies ASTM and ASME steel in strict compliance with designated delivery states and customized mechanical processing:
Heat Treatment Options
- As-Rolled (AR): Standard hot-rolled condition for conventional fabrication.
- Normalized (N): Fine-grain structure for enhanced notch toughness (standard for thick A516 plates).
- Quenched & Tempered (Q&T): High strength and wear resistance.
- TMCP: Controlled rolling for high yield and low carbon equivalent.
- Stress Relieved (PWHT): Eliminates residual fabrication stresses.
Processing & Cutting Services
- CNC Flame & Plasma Cutting: Accurate cut-to-size per customer engineering drawings.
- Beveling & Edge Prep: V-groove preparation ready for direct welding.
- Surface Treatment: Shot blasting to Sa 2.5 cleanliness with protective shop primer coating.
- Bending & Rolling: Pre-forming cylindrical shells and dished heads for vessel manufacturers.
Quality Control, Testing & Material Documentation
For mission-critical engineering projects, steel quality is non-negotiable. Megato Group enforces an exhaustive quality assurance regimen to verify that every heat and lot meets governing ASTM specs and purchase orders.
Testing & Inspection
- Chemical Analysis: Full optical emission spectroscopy for C, Si, Mn, P, S, Cr, Mo, Ni, and CEV.
- Mechanical Testing: Yield, tensile, elongation, and reduction of area.
- Charpy V-Notch (CVN): Impact testing at 0°C, -20°C, or -46°C.
- Ultrasonic Testing (UT): Verified to ASTM A435 or ASTM A578 (Level A/B).
- Sour Service Testing: NACE TM0284 HIC & NACE TM0177 SSCC testing for wet H2S service.
Certification & Traceability
- Mill Test Certificate (MTC): Full traceability according to EN 10204 3.1; 3.2 available upon request.
- ASME Code Compliance: Verification against applicable BPVC Section II editions.
- Dimensional Audits: Certified tolerances per ASTM A6 (plates) and ASTM A530 (pipes).
- Third-Party Inspection: Supported by SGS, Bureau Veritas (BV), and TÜV Rheinland.
Connected Product Lines & Target Applications
Construction & Infrastructure
Steel Grade: ASTM A36, A572 Gr. 50, A709
→ Product: Structural Steel Plate
Frequently Asked Questions
What are ASTM steel grades?
ASTM steel grades are material specifications published by ASTM International. They establish standardized chemical compositions, mechanical thresholds, testing protocols, and dimensional limits for steel plates, pipes, structural shapes, bars, and fasteners used across global industries.
What are ASME steel grades?
ASME steel grades are materials reviewed, approved, and designated under the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (BPVC). In BPVC Section II Part A, approved ferrous specifications are assigned an “SA” prefix (e.g., SA516) denoting compliance for pressurized equipment fabrication.
What is the difference between ASTM and ASME?
The primary distinction is functional scope: ASTM develops voluntary material consensus specifications, whereas ASME establishes engineering design, safety, and fabrication codes for boilers, pressure vessels, and nuclear components. ASME materials are specifically reviewed to ensure safe performance under defined pressure and temperature conditions.
Is ASTM A516 the same as ASME SA516?
SA516 is an ASME material designation derived from and closely related to ASTM A516. In many manufacturing editions they are virtually identical; however, ASME may impose additional restrictions, edition constraints, or specific testing requirements. Material certified as dual-grade (ASTM A516 / ASME SA516) satisfies both standards simultaneously.
Can ASTM steel grades be used for ASME projects?
Project applicability depends on the governing ASME Code edition, material specification, product form, testing certification, and purchaser contract conditions. Under specific ASME BPVC Section II rules, ASTM materials may be accepted if the specification edition matches or has been formally evaluated as equivalent by the code.
What is the difference between A36 and A572?
While ASTM A36 is a traditional carbon structural steel with a minimum yield strength of 36 ksi (250 MPa), ASTM A572 Grade 50 is a high-strength low-alloy (HSLA) steel with a minimum yield of 50 ksi (345 MPa). A572 delivers a higher strength-to-weight ratio, allowing for thinner plate sections and lighter overall structures.
Need a Specific ASTM / ASME Steel Grade?
Tell us your required steel grade, product form (heavy plate, coil, seamless pipe), dimensions, delivery condition (As-rolled, Normalized, Q&T), destination port, and certification requirements (MTC EN 10204 3.1 / 3.2, UT testing, third-party inspection). Megato Group will verify code compliance and provide a competitive CIF/FOB quotation within 24 hours.