ASME SA455 Steel Plate | SA455 High-Strength Mn Vessel Plate

ASME SA455 is the Code name for high-strength manganese carbon steel plates intended for welded pressure vessels. The specification is ASME SA-455/SA-455M. There is no Grade A, Grade B or Grade 70 split. The product is one chemistry with three tensile lines by thickness, and the thickness ceiling is 20 mm (3/4 in.). As Direct Mill Supply by SHH STEEL, the plate is produced to ASME SA-455/SA-455M.

The same plate is written SA455, SA-455, SA455M, ASME SA455, ASTM A455, A455, A455M and A/SA455. They all mean this specification. ASTM A455/A455M is the product companion used when the order is written to ASTM rather than to the Code book.

This is thin, high-manganese carbon vessel plate. It is not SA516 Gr.70 and not A516 Gr.70. Those pages are fine-grain carbon with thick-plate capability and a different toughness habit. It is not SA515 Gr.70. SA515 is silicon-killed carbon for intermediate and higher temperature. It is not SA285 Gr.C or A285 Gr.C. SA285 Grade C is lower-tensile carbon with a 50 mm ceiling.

It is not Mn-Mo plate like SA302 Gr.B. It is not nickel plate like SA203 Gr.A or SA203 Gr.D. It is not Cr-Mo like SA387 Gr.22 Cl.2. It is not QT 690 MPa plate like SA517 Gr.Q. A mill cannot recertify those heats as SA455.

The steel is usually made to a semi-killed or capped deoxidation practice. Silicon-killed or aluminum-killed steel is allowed at the purchaser’s or producer’s option. That is a different melting habit from SA516 Gr.60, which is killed fine-grain carbon.

Plates are normally supplied as-rolled. They may be ordered normalized or stress-relieved, or both. Maximum thickness furnished under this specification is 20 mm. If the inquiry is 25 mm or 40 mm, SA-455 is the wrong book. Move the conversation to SA516 Gr.70, SA515 Gr.70 or SA537 Cl.1.

For Code work the plate is used under ASME Section VIII. Dual marking ASME SA455 / ASTM A455 is available. Certificates can be EN 10204 3.1 or EN 10204 3.2.

When a project is still choosing carbon vessel plate, a China mill Agent path through SHH STEEL puts SA455 next to SA285 Gr.A, SA302 Gr.B and A36 steel plate, so the buyer can see whether they need thin high-Mn vessel plate, low-tensile carbon vessel plate, Mn-Mo alloy or structural carbon. High-Mn thin carbon and those other families are different purchases. Company scope: China steel Mill Agent-SHH STEEL.

This plate is a vessel product. It is not structural ASTM A36 steel plate. It is not QT alloy like SA517 Gr.Q.

Chemistry for ASME SA455 is reported as heat analysis and product analysis under ASME SA-455/SA-455M Table 1. There is one chemistry table. Strength changes with thickness, not with a second grade name.

Heat Analysis — ASME SA455 / SA-455

Product Analysis — SA455 / A455

Two footnotes change how this table is used.

When silicon is higher than 0.10%, the carbon maximum shall be 0.28%. That matters if the order asks for silicon-killed plate. Optional silicon may be 0.40% max heat and 0.45% max product. If that option is taken, carbon drops to 0.28% max.

For each reduction of 0.01 percentage point below the specified carbon maximum, an increase of 0.06 percentage point above the specified manganese maximum is permitted, up to 1.50% Mn by heat analysis and 1.60% Mn by product analysis. That is the high-manganese lever that gives SA455 its name.

Compare that ladle with nearby carbon pages. SA516 Gr.70 is killed fine-grain carbon with a different C-Mn-Si table and no 20 mm ceiling. SA515 Gr.70 is silicon-killed for higher temperature. SA285 Gr.C allows 0.28% C but only 0.90% Mn max and stops at 50 mm with a lower tensile window. A285 Gr.C is the same carbon family, not high-Mn SA455.

If the drawing says ASME SA455 or SA-455, the ladle must sit in this table. SHH STEEL reports heat analysis on every certificate and adds product analysis when SA-20 or the vessel specification requires it.

Tensile of SA455 falls as thickness rises. There are three lines, all inside 20 mm.

Tensile Requirements — ASME SA455 per ASME SA-455/SA-455M

A 8 mm plate is tested to 260 MPa yield and 515–655 MPa tensile. A 16 mm plate is tested to 240 MPa yield and 485–620 MPa tensile. Do not apply the thin-line numbers to 18 mm plate and call the heat compliant.

Elongation adjustments follow SA-20 when the specimen thickness requires them.

Density is 7.85 g/cm³. Hardness is not a default line. Charpy is not a hidden default. If the vessel needs a stated impact temperature, write it as a supplementary requirement.

Compare nearby pages. A516 Gr.70 is 485–620 MPa with thick-plate capability. SA537 Cl.1 is heat-treated carbon at heavier gauges. SA517 Gr.Q is QT 690 MPa alloy. SA455 is thin high-Mn carbon, nothing else.

Order ASME SA455 when the drawing names SA-455 and thickness is 20 mm or less. SHH STEEL does not stretch this spec past 20 mm.

ASME SA455 is selected for welded vessels that need high-Mn carbon strength in thin plate. Allowable stress for Code work comes from ASME Section II Part D for SA-455, not from a mill flyer.

Typical use is thin shells, heads and layers inside 20 mm. It is not a creep Cr-Mo grade and not a cryogenic nickel grade. If the equipment is written to SA203 Gr.A or A203 Gr.A, this page is the wrong purchase.

Coil-origin plate furnished without heat treatment or with stress relieving only must also meet the extra A20 / SA-20 coil rules, including additional testing and reporting.

SA455 is high-manganese carbon. Welding is Code welding.

Procedures for Code work are qualified to ASME Section IX. Low-hydrogen consumables such as E7018 (AWS A5.1) are the usual shop choice. Carbon can sit at 0.33% unless silicon-killed practice drops it to 0.28%. Calculate carbon equivalent from the actual ladle.

Preheat depends on thickness, restraint and hydrogen. Even at 12–20 mm, a restrained high-Mn joint should not be started cold and wet.

Do not copy a SA387 Gr.22 Cl.2 or SA517 Gr.Q procedure onto ASME SA455. The fabricator owns the WPS.

Plates are normally supplied as-rolled.

They may be ordered normalized, stress-relieved, or both.

There is no mandatory normalize-all-thicknesses rule like SA225 Grade D. If the drawing is silent, as-rolled is the usual supply. SHH STEEL reports the actual delivery condition on the MTC.

Usual delivery is as-rolled high-Mn carbon vessel plate to 20 mm. Normalized or stress-relieved plate is supplied when specified.

The certificate lists ASME SA455 and, when dual certified, ASTM A455; heat number; heat analysis; product analysis when ordered; tensile results by the correct thickness line; deoxidation practice when relevant; heat-treatment condition; and supplementary tests.

Certificates may be EN 10204 3.1 or EN 10204 3.2.

Usual supply range from SHH STEEL for SA455 high-strength Mn vessel plate:

• Thickness: about 5 mm – 20 mm (specification maximum)
• Width: typically up to about 2500–3000 mm from coil or plate mills
• Length: up to about 12000 mm

If the inquiry is 25 mm, this specification cannot be used. Cut-to-length shells inside 20 mm are available.

Dimensional limits follow ASME SA-20. Coil-origin plate has extra A20 rules. UT is supplementary.

Most export ASME SA455 orders add extras. SHH STEEL does not assume them.

Killed steel. Si-killed or Al-killed when specified; watch the 0.28% C cap if Si exceeds 0.10%.

Heat treatment. Normalize or stress relieve as specified.

Simulated PWHT. Same-heat coupons when the vessel cycle is known.

Charpy details. Temperature and energy as agreed.

NDE. UT to A435 / A577 / A578.

Restricted chemistry. Tighter P, S; controlled C-Mn trade-off.

Third-party. EN 10204 3.2.

For stamping, write ASME SA455 or dual SA455 / A455.

Do not use this grade as a silent stand-in for SA203 Gr.D or SA517 Gr.S.

SHH STEEL works as a China Mill Direct Exporter for plates to ASME SA-455/SA-455M. On ASME SA455 that means mill pricing, dual SA455/A455 marking, the 0.33% carbon / 0.85–1.20% manganese table, thickness-correct tensile lines at 9.5 mm and 15 mm, the 20 mm ceiling respected, 3.1 as standard and 3.2 when specified.

We keep the order on the right specification. SA455 is not SA516 Gr.55. SA455 is not SA285 Gr.A. SA455 is not SA517 Gr.Q. If the plate is thicker than 20 mm, we will say so before anyone tries to buy SA455.

Company scope: China steel Mill Agent-SHH STEEL.

ASME SA455 Steel Plate is high-strength manganese carbon vessel plate under ASME SA-455/SA-455M, limited to 20 mm, with three tensile lines by thickness. Whether the inquiry says SA455, SA-455, ASME SA455 or A455, SHH STEEL supplies plate with heat and product analysis, as-rolled or specified heat treatment, thickness-correct tensile results, and EN 10204 3.1 or 3.2 certification.

As a China mill Distributor, SHH STEEL provides ASME SA455 / SA455 High-Strength Mn Vessel Plate for thin ASME Section VIII work.

Contact SHH STEEL for mill rolling, dual SA455/A455 marking, 3.2 inspection or a quotation.

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