ASME SA285 Grade B Steel Plate | SA285 Gr.B Pressure Vessel Plate

ASME SA285 Grade B sits between Grade A and Grade C in ASME SA-285/SA-285M. The specification covers carbon steel plates of low and intermediate tensile strength for fusion-welded pressure vessels. Grade C takes most of the search traffic. Grade B is the mid-strength option when the drawing does not need the Grade C tensile window. As a China mill Agent, SHH STEEL supplies this plate to ASME SA-285/SA-285M.

The same plate is written SA285 Gr.B, SA285GRB, SA285 GR B, SA-285 Grade B, SA285 Grade B, ASME SA285 GR.B, ASME SA285GRB, ASTM A285 Grade B, A285 Gr.B, A285GRB and A/SA285 Grade B. They all mean Grade B. ASTM A285/A285M is the product companion.

Do not treat this page as ASME SA516 or ASTM A516. A516 is fine-grain, higher-quality vessel plate. Do not treat it as ASME SA515 either. SA515 is silicon-killed carbon plate for intermediate and higher temperature. ASME SA285 Grade B is the simpler mid-tensile carbon vessel grade, usually supplied as-rolled, with a specification thickness ceiling of 50 mm (2 in.).

The steel follows ASME SA-20 general requirements. It may be rimmed, capped, semi-killed or killed as agreed. Fine austenitic grain practice is not the default the way it is on SA516. If the drawing wants killed steel, fine grain, or normalized delivery, that has to be written on the purchase order.

For Code work the plate is used under ASME Section VIII. Dual marking ASME SA285 Grade B / ASTM A285 Grade B 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 Distributor path through SHH STEEL puts SA285GRB next to ASME SA537, ASTM A537, ASME SA387 and ASTM A285, so the buyer can see whether Grade B is enough or whether the vessel actually needs Grade C or SA516.

This plate belongs to the Pressure Vessel Steel Plates family. It is not a structural HSLA Steel Plates substitute and not a Carbon Steel Plates structural grade such as A36.

Chemistry for ASME SA285 Grade B is reported as heat analysis and, when specified, product analysis under ASME SA-285/SA-285M. Carbon is the grade marker. Grade B allows less carbon than Grade C.

Heat Analysis — ASME SA285 Grade B / SA285 Gr.B

Product Analysis — SA285GRB / A285 Grade B

Silicon is not mandated in the base SA-285 Grade B table the way it is in SA515. Copper 0.20–0.35% can be specified when atmospheric corrosion resistance is wanted. If the drawing requires killed steel, a silicon or aluminum minimum belongs on the mill order, not as an assumption.

A Grade C heat cannot be recertified as Grade B if carbon sits above the Grade B maximum. If the drawing says ASME SA285 Grade B or ASME SA285GRB, the ladle and the tensile test must sit in Grade B. SHH STEEL reports heat analysis on every certificate and adds product analysis when ASME SA-20 or the vessel specification requires it.

Tensile Requirements — ASME SA285 Grade B per ASME SA-285/SA-285M

Grade A is 310–450 MPa. Grade B is 345–485 MPa. Grade C is 380–515 MPa. If the drawing says SA285 Gr.B, do not ship Grade C and hope the numbers overlap. The carbon maximum is also different.

Density is 7.85 g/cm³. Hardness is not a default requirement in SA-285. Charpy impact is not a default line. If the vessel needs a stated test temperature and energy, that is a supplementary requirement.

Specimens follow ASME SA-20. Simulated PWHT of coupons is added when the shop will stress-relieve or otherwise heat-treat the vessel after welding.

Order ASME SA285 Grade B when the drawing names Grade B and thickness is 50 mm or less. If the vessel needs the Grade C tensile window, fine-grain practice, guaranteed impact, or plate thicker than 50 mm, change the specification in writing. SHH STEEL does not swap SA285GRB for SA285GRC or A516 Gr.70 without a revision.

ASME SA285 Grade B is selected for fusion-welded tanks, drums and low-to-moderate pressure equipment that do not need Grade C strength or the toughness package of SA516. Allowable stress for Code work comes from ASME Section II Part D for SA-285 Grade B, not from a mill flyer.

Typical use is shop tanks, air receivers, low-pressure process drums and utility vessels. It is not a cryogenic nickel grade, not a QT 690 MPa grade, and not a creep-focused Cr-Mo grade.

SA285GRB is a plain carbon vessel plate. Welding is straightforward compared with SA517 QT alloy plate, but it is still 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. Preheat depends on thickness, restraint and hydrogen. Grade B carbon is lower than Grade C, which helps, but a thick, restrained joint should still not be started cold and wet.

PWHT follows the vessel specification and ASME Section VIII, not a mill default. Simulated PWHT of mill coupons should be on the purchase order when the shop cycle is known.

Do not copy an SA517 or SA387 procedure onto ASME SA285 Grade B. Procedure review can go through steel welding services. The fabricator owns the qualified WPS.

Standard delivery of ASME SA285 Grade B is as-rolled.

Normalizing, stress relieving or annealing is supplementary. If the drawing says “normalized SA285 Gr.B”, that cycle is ordered and recorded. Do not assume every SA285GRB plate left the mill normalized.

SHH STEEL reports the actual delivery condition on the MTC.

Usual delivery is as-rolled pressure-vessel plate. Normalized or stress-relieved plate is supplied when specified.

The certificate lists ASME SA285 Grade B and, when dual certified, ASTM A285 Grade B; heat number; heat analysis; product analysis when ordered; tensile results; heat-treatment condition; and supplementary tests.

Surface is vessel-plate quality. Shot blasting and shop primer are available.

Certificates may be EN 10204 3.1 or EN 10204 3.2.

Usual supply range from SHH STEEL for SA285 Gr.B pressure vessel plate:

• Thickness: 6 mm – 50 mm (Grade B maximum in ASME SA-285 is 50 mm)
• Width: up to about 4000 mm
• Length: up to about 12000 mm

If the inquiry is 60 mm, SA-285 is the wrong specification. Cut-to-length shells and nest sizes are available inside 50 mm.

Dimensional limits follow ASME SA-20. Thickness, width, length, flatness and camber are vessel-plate tolerances.

Ultrasonic testing to A435 or A578 is added when specified. Finished sizes go through steel cutting services.

Most export ASME SA285 Grade B orders add tests beyond the base tensile table. SHH STEEL does not assume these extras.

Killed steel / fine grain. Base SA-285 does not force killed, fine-grain practice. If the vessel specification wants it, write it.

Heat treatment. Normalize or stress relieve as specified. Simulated PWHT of coupons when the shop cycle is known.

Charpy impact. Temperature, energy, specimen orientation and location as agreed. Not a default in SA-285.

NDE. UT to A435 / A577 / A578; edge MT/PT after cutting.

Hardness survey. Surface HBW when the datasheet sets a window.

Restricted chemistry. Tighter P, S, copper addition, or residuals per SA-20.

HIC / NACE. Only when TM0284 or MR0175 / ISO 15156 is cited. Grade B is not automatically sour-service plate.

Z-direction. A770 or Z15/Z25/Z35 when the joint is strained.

Third-party. Witness of rolling, testing and documents. Output can be EN 10204 3.2.

These tests run through steel testing service. If an item is not on the purchase order, it is not assumed.

These names are used for project comparison. They are not automatic substitutes.

For stamping, write ASME SA285 Grade B or dual SA285 / A285 Grade B. Nearby vessel pages: ASME SA516, ASTM A516, ASME SA537, ASTM A537.

ASME SA285 Grade B / SA285 Gr.B is selected when a Section VIII or equivalent vessel needs mid-tensile carbon plate inside 50 mm.

Related pages: petrochemical industry, energy industry, steel cutting services, steel welding services, steel testing service, worldwide shipping service.

SHH STEEL works as a China Mill Direct Exporter for plates to ASME SA-285/SA-285M. On ASME SA285 Grade B that means mill pricing, dual SA285/A285 marking, heat and product analysis, as-rolled or specified heat treatment, 3.1 as standard and 3.2 when specified, and the extra tests a vessel shop actually writes on the PO.

We also keep the order on the right grade. Grade B is not Grade C. Grade B is not SA516 Gr.70. Grade B is not A36. If the thickness is 60 mm, we will say so before anyone tries to buy SA285. If the drawing wants the Grade C tensile window or fine-grain impact-tested plate, we will point the inquiry to SA285 Grade C or SA516 instead of forcing SA285GRB.

Export packing goes through worldwide shipping service. Company scope: China steel Mill Agent-SHH STEEL.

ASME SA285 Grade B Steel Plate is the mid-strength carbon grade in ASME SA-285/SA-285M for low- and intermediate-tensile pressure vessels. Whether the inquiry says SA285 Gr.B, SA285GRB, ASME SA285 GR.B, ASME SA285GRB or A285 Grade B, SHH STEEL supplies plate with heat and product analysis, as-rolled or specified heat treatment, agreed extras, and EN 10204 3.1 or 3.2 certification.

As Direct Mill Supply by SHH STEEL, we provide ASME SA285 Grade B / SA285 Gr.B Pressure Vessel Plate for ASME Section VIII fabrication.

Contact SHH STEEL for mill rolling, dual SA285/A285 marking, 3.2 inspection or a quotation.

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