ASTM A516 Grade 70 Normalized vs As-Rolled: What Pressure Vessel Buyers Need to Know

ASTM A516 Grade 70 is one of the most frequently specified carbon steel plates for welded pressure vessels, tanks and process equipment, but writing only “A516 Gr 70 plate” on an RFQ is often not enough.

One of the most important purchasing questions is whether the plate should be supplied in the as-rolled or normalized condition.

The answer depends on plate thickness, notch-toughness requirements, design conditions and the governing project specification.

Two plates can both be certified as ASTM A516 Grade 70 while having different heat-treatment histories. That difference can matter during pressure-vessel fabrication, welding, impact testing and final material acceptance.

This guide explains the current ASTM requirements and shows international buyers how to write a technically complete A516 Grade 70 plate inquiry.

Quick Answer: When Does ASTM A516 Grade 70 Need to Be Normalized?

Under ASTM A516/A516M, the basic heat-treatment rule can be summarized as follows:

This is why buyers should never assume that every A516 Grade 70 plate is normalized.

For thin and medium plate, the required delivery condition should be written clearly in the purchase order.

What Is ASTM A516 Grade 70?

ASTM A516/A516M covers carbon steel plate intended primarily for welded pressure vessels where improved notch toughness is important.

The specification contains four strength grades:

• Grade 55 [380]
• Grade 60 [415]
• Grade 65 [450]
• Grade 70 [485]

Grade 70 is the highest tensile-strength grade within the conventional A516 series and is widely specified for pressure-containing equipment in industries such as:

• oil and gas processing;
• petrochemical plants;
• refineries;
• pressure vessels;
• industrial boilers;
• storage vessels;
• heat-exchanger shells;
• process equipment;
• energy projects.

ASTM A516 plate is not the same product category as ordinary structural plate such as ASTM A36.

For a broader purchasing comparison, see JUDE Steel’s

Carbon Steel Plate Tolerances, ASTM Requirements & RFQ Guide
.

Current ASTM A516 Grade 70 Mechanical Requirements

For ASTM A516 Grade 70 [Grade 485], the standard specifies the following basic tensile requirements.

These are specification requirements, not generic “typical properties.”

Actual test values for the supplied plate should be verified on the material certificate and compared with the applicable ASTM edition and purchase order.

Why Does A516 Grade 70 Chemistry Depend on Plate Thickness?

One common online purchasing mistake is treating A516 Grade 70 as if it had one universal maximum carbon value for every plate thickness.

ASTM A516 chemical requirements include thickness-dependent carbon limits.

For Grade 70, the permitted carbon maximum increases across specified thickness ranges.

Therefore, a buyer comparing two Mill Test Certificates should first check:

• the exact grade;
• plate thickness;
• whether the reported chemistry is heat analysis or product analysis;
• the applicable ASTM edition;
• any project-specific chemistry restrictions.

Do not reject or approve A516 Grade 70 by comparing its MTC with a random online composition table.

JUDE Steel has published a separate guide explaining how to verify material certificates:

How to Read a Carbon Steel Mill Test Certificate (MTC)
.

What Does “As-Rolled” A516 Grade 70 Mean?

As-rolled plate is supplied after the rolling process without a separate normalization heat-treatment cycle.

For A516 plate 40 mm [1.50 in.] and under, ASTM permits the material to be normally supplied in this condition unless the purchaser or another requirement specifies additional heat treatment.

As-rolled A516 Grade 70 can be appropriate when:

• the plate thickness falls within the permitted range;
• the project does not require normalization;
• notch-toughness requirements do not trigger normalization;
• the engineering specification accepts the delivery condition;
• the supplied plate meets all required mechanical properties.

“As rolled” should not be interpreted as lower-quality steel.

It is a permitted delivery condition under defined circumstances.

What Does Normalized A516 Grade 70 Mean?

Normalization is a heat-treatment process in which steel is heated into an appropriate austenitic temperature range and subsequently cooled in air under controlled conditions.

The objective is to develop a more uniform and refined microstructure compared with certain untreated hot-rolled conditions.

For pressure-vessel applications, normalization can support:

• more uniform microstructure;
• improved notch-toughness performance in suitable material;
• more consistent properties through thicker sections;
• better control of properties after rolling;
• compliance with project or code requirements.

However, “normalized” should not be marketed as an automatic guarantee of a particular Charpy value.

Impact performance must still be verified against the required test temperature, specimen orientation, specimen size, absorbed-energy requirement and applicable project specification.

As-Rolled vs Normalized A516 Grade 70

The purchasing decision should therefore not be based on the assumption that normalized plate is always better.

The correct condition is the condition required by the vessel design and material specification.

Why Is the 40 mm Thickness Rule Important?

The 40 mm [1.50 in.] threshold is one of the most important technical details in ASTM A516 procurement.

For plate at or below this thickness, as-rolled supply is normally permitted.

For plate above this thickness, ASTM A516 requires normalization.

A buyer requesting:

ASTM A516 Gr 70, 60 mm plate, as rolled

would therefore be creating a specification conflict under the standard unless another approved route specifically applies.

A more technically appropriate request would identify:

ASTM A516/A516M Grade 70, 60 mm plate, normalized condition

before adding project-specific inspection and testing requirements.

Does A516 Grade 70 Automatically Require Charpy Impact Testing?

No.

This distinction is important.

ASTM A516 is intended for pressure-vessel applications where improved notch toughness is important, but that does not mean every commercial A516 Grade 70 plate automatically comes with the same Charpy V-notch requirement.

Impact-testing requirements can come from:

• a supplementary requirement;
• the pressure-vessel design code;
• the purchaser’s engineering specification;
• minimum design metal temperature requirements;
• customer specifications;
• end-user or EPC requirements.

Where impact testing is required, the RFQ should define the actual acceptance conditions.

What Should Be Specified for a Charpy V-Notch Test?

Writing only:

Impact test required

is usually incomplete.

A technically useful RFQ should define, where applicable:

• test method or governing specification;
• test temperature;
• required absorbed energy;
• specimen orientation;
• specimen size;
• sampling location;
• number of specimens;
• acceptance criteria;
• reporting requirements.

For example:

Charpy V-notch impact testing required at -20°C according to project specification; transverse specimens; acceptance criteria per attached material specification.

is significantly clearer than:

A516 Gr70 with impact test.

How Does Impact Testing Affect Heat Treatment?

ASTM A516 establishes an important relationship between notch-toughness testing and normalization.

When notch-toughness tests are required on plates 40 mm [1.50 in.] and under, the plates are normally required to be normalized unless otherwise specified by the purchaser.

This means a buyer cannot treat the following requirements as unrelated:

• plate thickness;
• delivery condition;
• impact testing;
• test temperature;
• pressure-vessel design conditions.

They should be reviewed together before an order is placed.

ASTM A516 vs ASTM A20: Why Buyers Need Both

ASTM A516 is the specific product specification for the pressure-vessel plate.

ASTM A20/A20M provides general requirements applicable to pressure-vessel steel plates covered by specifications including A516.

ASTM A20 can address areas such as:

• ordering information;
• testing and retesting;
• dimensional and mass variations;
• quality requirements;
• repair of defects;
• marking;
• certification;
• supplementary requirements.

Professional buyers should therefore avoid treating ASTM A516 as a completely standalone specification.

The applicable requirements of A516 and A20 should be considered together.

Plate Produced From Coil Requires Additional Attention

ASTM A516 also contains specific provisions for plates produced from coil.

For coil-produced plates furnished without heat treatment or with stress relieving only, additional ASTM A20 requirements apply, including additional testing and reporting provisions.

This matters because:

• discrete mill plate and plate cut from coil do not necessarily follow identical qualification routes;
• test frequency can differ;
• the MTC should reflect the actual production route;
• the purchaser may need to know whether the material originated as plate or coil.

For specification-critical pressure-vessel projects, ask the supplier to confirm the production route before accepting the quotation.

ASTM A516 vs ASME SA-516

ASTM A516/A516M and ASME SA-516/SA-516M are closely related pressure-vessel material specifications, but buyers should not write the designations interchangeably without checking the project requirement.

For equipment designed and constructed under the ASME Boiler and Pressure Vessel Code, the material specification may be stated as:

ASME SA-516/SA-516M Grade 70.

A mill may be able to provide material certified to applicable ASTM and ASME requirements, but dual certification should be confirmed on the purchase order and MTC rather than assumed.

Where Is A516 Grade 70 Commonly Used?

Typical fabricated products may include:

• pressure-vessel shells;
• pressure-vessel heads;
• separator vessels;
• process drums;
• heat-exchanger shells;
• storage vessels;
• industrial boilers;
• oil and gas processing equipment;
• petrochemical vessels;
• refinery pressure equipment.

The material grade alone does not determine whether a plate is suitable for a specific vessel.

Design pressure, temperature, corrosion allowance, weld procedure, post-weld heat treatment, impact requirements and governing construction code must also be considered.

When Might Normalized A516 Grade 70 Be Preferred Below 40 mm?

Even when normalization is not automatically required by thickness, purchasers may intentionally order normalized plate.

Examples can include:

• low-temperature pressure-vessel projects;
• projects requiring Charpy impact testing;
• critical welded equipment;
• EPC specifications requiring normalized supply;
• end-user material specifications;
• projects requiring additional toughness control;
• certain oil, gas and petrochemical applications.

The decision should come from the project specification—not from a generic assumption that every pressure-vessel plate must be normalized.

Does Normalizing Improve Weldability?

Normalizing can improve microstructural uniformity and toughness, but it should not be described as a substitute for proper welding engineering.

Weldability also depends on:

• actual chemical composition;
• carbon equivalent where specified;
• plate thickness;
• heat input;
• preheat requirements;
• interpass temperature;
• filler material;
• joint restraint;
• post-weld heat treatment;
• welding procedure qualification.

Pressure-vessel fabricators should use a qualified WPS/PQR appropriate to the material and construction code.

What About HIC and Sour-Service Requirements?

A516 Grade 70 is frequently requested for oil, gas and petrochemical projects, but standard A516 certification alone does not mean the plate has been qualified for every wet-H2S or sour-service environment.

Projects may require additional controls such as:

• HIC testing;
• SSC-related requirements;
• restricted sulfur or phosphorus;
• hardness limitations;
• additional chemistry restrictions;
• normalized delivery condition;
• project-specific testing;
• NACE/ISO-related requirements where applicable.

These requirements should be stated before quotation.

Do not request simply:

A516 Gr70 NACE plate

without identifying the applicable project specification and testing requirements.

When Is Ultrasonic Testing Required?

Ultrasonic examination is not automatically mandatory for every A516 Grade 70 plate.

Depending on the project, buyers may specify examination under standards such as:

• ASTM A435/A435M;
• ASTM A578/A578M;
• another applicable project or pressure-vessel inspection requirement.

The required standard and acceptance level should be included in the RFQ.

Writing:

UT 100%

without an acceptance standard may not provide enough information for accurate quotation.

What Should Be Checked on the A516 Grade 70 MTC?

For pressure-vessel plate, buyers should verify more than the grade name.

Check:

• manufacturer;
• heat number;
• ASTM A516/A516M Grade 70 designation;
• plate dimensions;
• heat analysis;
• yield strength;
• tensile strength;
• elongation;
• delivery condition;
• normalized condition where required;
• impact-test results where specified;
• test temperature;
• UT results where specified;
• supplementary requirements;
• traceability.

JUDE Steel’s detailed

MTC inspection guide

explains how to match test records with the delivered material.

What Should Be Inspected Before Shipment?

For an international A516 Grade 70 shipment, the inspection plan may include:

• plate marking;
• heat-number traceability;
• thickness measurement;
• width and length;
• flatness;
• surface condition;
• edge condition;
• quantity and weight;
• MTC review;
• heat-treatment documentation;
• impact reports where required;
• UT reports where required;
• packing and shipping marks.

For a more complete procedure, see

How to Inspect Carbon Steel Plate Before Shipment
.

How to Write a Professional A516 Grade 70 RFQ

A complete RFQ reduces technical clarification and helps the supplier determine whether stock material can be used or new production is required.

Example of a Complete A516 Grade 70 Inquiry

This inquiry gives the supplier significantly more information than:

Please quote A516 Gr70 plate.

Common A516 Grade 70 Purchasing Mistakes

International buyers should avoid the following specification errors:

• not stating the delivery condition;
• assuming every A516 Grade 70 plate is normalized;
• requesting as-rolled material above the permitted thickness threshold;
• writing “impact tested” without a test temperature or acceptance criterion;
• assuming impact testing is automatically included;
• requesting “UT” without an examination standard;
• ignoring ASTM A20 requirements;
• confusing ASTM A516 with ordinary structural plate;
• assuming ASTM A516 and ASME SA-516 certification are automatically identical;
• accepting generic datasheet values instead of actual MTC results;
• failing to identify sour-service or HIC requirements before ordering;
• not checking whether the material was produced as discrete plate or from coil.

How JUDE Steel Supports A516 Grade 70 Plate Procurement

JUDE Steel supplies carbon and alloy steel products for pressure equipment, fabrication, energy and industrial projects.

Buyers looking for pressure-vessel plate can review the

JUDE Steel Carbon & Alloy Steel Plate range
.

For project-based A516 Grade 70 requirements, provide the complete material specification before quotation so that the required:

• grade;
• thickness;
• delivery condition;
• impact testing;
• UT;
• certification;
• processing;
• quantity;
• destination

can be reviewed together.

For the current official ASTM specification, buyers can also review:

ASTM A516/A516M-25
.

Frequently Asked Questions

Is ASTM A516 Grade 70 always supplied normalized?

No. Plates 40 mm [1.50 in.] and under are normally permitted to be supplied in the as-rolled condition unless normalization or another heat treatment is specified. Plates above 40 mm are required to be normalized under ASTM A516.

Does A516 Grade 70 over 40 mm have to be normalized?

Yes. ASTM A516/A516M requires plates over 40 mm [1.50 in.] to be normalized.

Can I order normalized A516 Grade 70 below 40 mm?

Yes. Plate at or below 40 mm may be ordered normalized even though as-rolled supply is normally permitted. Project specifications frequently require normalized material for specific pressure-vessel applications.

Does A516 Grade 70 automatically include a Charpy impact test?

No. Impact-testing requirements must be determined from the applicable material specification, supplementary requirements, pressure-vessel code and project specification. The required test temperature and acceptance criteria should be stated in the purchase order.

Why is normalized plate often specified when Charpy testing is required?

Normalization can provide a more uniform and refined microstructure and can support notch-toughness performance. ASTM A516 specifically requires normalization for plates 40 mm and under when notch-toughness testing is required unless otherwise specified by the purchaser.

What is the yield strength of ASTM A516 Grade 70?

ASTM A516 Grade 70 [485] specifies a minimum yield strength of 260 MPa [38 ksi].

What is the tensile strength of A516 Grade 70?

The specified tensile-strength range is 485–620 MPa [70–90 ksi].

Is ASTM A516 Grade 70 the same as ASME SA-516 Grade 70?

They are closely related specifications, but buyers should follow the designation required by the project and construction code. If dual ASTM/ASME certification is required, it should be confirmed in the purchase order and material documentation.

Is HIC testing included with standard A516 Grade 70?

Not automatically. HIC or sour-service testing must be specified when required by the project. The applicable testing standard, acceptance criteria and additional chemistry or hardness requirements should be defined before ordering.

Is ultrasonic testing mandatory for all A516 Grade 70 plates?

No. UT is required when specified by the project, purchaser or applicable engineering requirements. The RFQ should identify the examination standard and acceptance level.

What information should I send for an A516 Grade 70 quotation?

Provide the complete standard and grade, delivery condition, plate dimensions, quantity, impact requirements, UT requirements, certification, processing requirements, destination and applicable project specification.

Request ASTM A516 Grade 70 Pressure Vessel Plate

Technical Note:
This article is intended for preliminary material selection and procurement guidance. Final pressure-vessel material requirements must follow the applicable ASTM or ASME specification, construction code, engineering design, service temperature, welding procedure, impact requirements and project purchase specification.