ASME SA299 Grade A Steel Plate | SA299 Gr.A Mn-Si Vessel Plate
What is ASME SA299 Grade A Steel Plate?
ASME SA299 Grade A is the workhorse grade in ASME SA-299/SA-299M. The specification covers carbon-manganese-silicon steel plates for welded boilers and other pressure vessels. Grade A is the grade most buyers search. Grade B is the higher-strength sister in the same book. As Direct Mill Supply by SHH STEEL, the plate is produced to ASME SA-299/SA-299M.
The same plate is written SA299 Gr.A, SA299GRA, SA299 GR A, SA-299 Grade A, SA299 Grade A, ASME SA299 GR.A, ASME SA299GRA, ASTM A299 Grade A, A299 Gr.A, A299GRA and A/SA299 Grade A. They all mean Grade A. ASTM A299/A299M is the product companion.
This is not fine-grain carbon like SA516 Gr.70. SA516 is the everyday Code carbon plate with a toughness habit. SA299 Grade A is a higher-manganese silicon-killed carbon aimed at boilers and vessels that want more Mn-Si strengthening than SA285 Gr.C or SA515 Gr.70. Tensile of Grade A is 515–655 MPa. That window sits next to SA516 Gr.70 (485–620 MPa) but the chemistry route is not the same.
It is not Mn-Mo plate like SA302 Gr.B. It is not nickel plate like SA203 Gr.A. It is not Cr-Mo like SA387 Gr.22 Cl.2. It is not QT 690 like SA517 Gr.Q. Do not recertify those heats as SA299GRA.
The steel follows ASME SA-20. Plates 50 mm and under are commonly supplied as-rolled and may be ordered normalized or stress-relieved. Plates over 50 mm are normally normalized. Maximum thickness is limited by the ability of the composition to meet the tensile table.
For Code work the plate is used under ASME Section VIII. Dual marking ASME SA299 Grade A / ASTM A299 Grade A 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 SA299GRA next to SA516 Gr.60, SA537 Cl.1 and SA285 Gr.A, so the buyer can see whether they need Mn-Si A299, fine-grain A516, heat-treated A537 or low-tensile A285.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Grade | ASME SA299 Grade A / SA299 Gr.A / SA299GRA | Confirmed |
| Product Specification | ASME SA-299/SA-299M | Applied |
| Companion Spec | ASTM A299 Grade A / A299GRA | Dual cert available |
| General Requirements | ASME SA-20 / ASTM A20 | Applied |
| Code Context | ASME Section VIII | As specified |
| Product Form | Carbon-manganese-silicon vessel plate | Available |
| Usual Delivery | As-rolled ≤50 mm; normalized >50 mm | Confirmed |
| Typical Supply | 8 mm – 150 mm | By mill enquiry |
| Width / Length | Up to about 4000 mm / 12000 mm | Mill capability |
| Certification | EN 10204 3.1 or 3.2 / third-party | As ordered |
This plate is a vessel product. It is not structural ASTM A36 steel plate.
Chemical Composition
Chemistry for ASME SA299 Grade A is reported as heat analysis and product analysis under ASME SA-299/SA-299M Table 1. Carbon and manganese both change at 25 mm.
Heat Analysis — ASME SA299 Grade A / SA299 Gr.A
| Element | ≤ 25 mm | Over 25 mm |
|---|---|---|
| Carbon (C), max | 0.26 | 0.28 |
| Manganese (Mn) | 0.90 – 1.40 | 0.90 – 1.50 |
| Phosphorus (P), max | 0.025 | 0.025 |
| Sulfur (S), max | 0.025 | 0.025 |
| Silicon (Si) | 0.15 – 0.40 | 0.15 – 0.40 |
Product Analysis — SA299GRA / A299 Grade A
| Element | ≤ 25 mm | Over 25 mm |
|---|---|---|
| Carbon (C), max | 0.26 | 0.28 |
| Manganese (Mn) | 0.84 – 1.52 | 0.84 – 1.62 |
| Phosphorus (P), max | 0.025 | 0.025 |
| Sulfur (S), max | 0.025 | 0.025 |
| Silicon (Si) | 0.13 – 0.45 | 0.13 – 0.45 |
Carbon maxima apply to both heat and product analysis. Grade B allows more carbon: 0.28% to 25 mm and 0.30% over 25 mm. That is why a Grade B heat cannot be stamped Grade A if carbon sits above the Grade A cap.
Manganese is the strengthening lever. Heat Mn is 0.90–1.40% to 25 mm and 0.90–1.50% over 25 mm. Silicon is killed-steel silicon, 0.15–0.40% heat. That combination is the whole point of calling this plate Mn-Si vessel plate instead of lumping it with A516 Gr.70.
If the drawing says ASME SA299 Grade A or ASME SA299GRA, the ladle must sit in the Grade A table. SHH STEEL reports heat analysis on every certificate and adds product analysis when ASME SA-20 or the vessel specification requires it.
Tighter P, S or residuals are supplementary. Vacuum treatment is available when written on the order.
Mechanical Properties
Yield of Grade A drops 15 MPa once thickness passes 25 mm. Tensile stays in one window.
Tensile Requirements — ASME SA299 Grade A per ASME SA-299/SA-299M
| Property | ≤ 25 mm (1 in.) | Over 25 mm (1 in.) |
|---|---|---|
| Tensile strength | 515 – 655 MPa (75 – 95 ksi) | 515 – 655 MPa (75 – 95 ksi) |
| Yield strength, min | 290 MPa (42 ksi) | 275 MPa (40 ksi) |
| Elongation in 200 mm (8 in.), min | 16% | 16% |
| Elongation in 50 mm (2 in.), min | 19% | 19% |
Yield is determined by the 0.2% offset method or the 0.5% extension-under-load method. A 20 mm plate is tested to 290 MPa. A 30 mm plate is tested to 275 MPa. Do not apply the thin-line yield to a 40 mm plate and call the heat compliant.
Grade B in the same specification is 550–690 MPa tensile, with 325 MPa yield to 25 mm and 310 MPa over 25 mm. If the drawing says Grade A, do not ship Grade B as a silent upgrade.
Density is 7.85 g/cm³. Hardness is not a default line. Charpy is not a hidden default. If the vessel needs 27 J at 0 °C or −20 °C, write it as a supplementary requirement.
Compare nearby carbon pages. SA516 Gr.70 is 485–620 MPa. SA515 Gr.70 is also 485–620 MPa but aimed at higher temperature silicon-killed service. SA285 Gr.C is only 380–515 MPa. SA299 Grade A sits above those carbon windows on manganese.
Material Comparison
| Grade | Route | Strength idea | Swap? |
|---|---|---|---|
| ASME SA299 Gr.A / ASTM A299 Gr.A | C-Mn-Si | 515–655 MPa / 290–275 MPa yield | This page |
| ASME SA299 Gr.B / ASTM A299 Gr.B | C-Mn-Si | 550–690 MPa / 325–310 MPa yield | Same family, higher strength |
| SA516 Gr.70 | Fine-grain carbon | 485–620 MPa | No |
| SA515 Gr.70 | Si-killed high-temp carbon | 485–620 MPa | No |
| SA285 Gr.C | Low/intermediate carbon PV | 380–515 MPa | No |
| SA302 Gr.B | Mn-Mo | Intermediate alloy | No |
| SA537 Cl.1 | Heat-treated carbon | Higher than as-rolled carbon | No |
| SA203 Gr.D | 3.5Ni low-temp | Nickel family | No |
Order ASME SA299 Grade A when the drawing names Grade A. SHH STEEL does not swap SA299GRA for A516 Gr.70 without a written revision.
Boiler and Pressure Vessel Service
ASME SA299 Grade A is selected for welded boilers and vessels that want C-Mn-Si strength without moving into Mn-Mo or Cr-Mo. Allowable stress for Code work comes from ASME Section II Part D for SA-299 Grade A, not from a mill flyer. Impact temperature is an order number.
Typical use is boiler drums, steam drums and process vessels specified to SA-299. It is not a creep Cr-Mo grade and not a cryogenic nickel grade.
Weldability
SA299GRA is silicon-killed carbon with a high manganese band. Welding is Code welding, not structural fillet practice.
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 equivalent should be calculated from the actual ladle. Preheat depends on thickness, restraint and hydrogen.
PWHT follows the vessel specification and ASME Section VIII. Simulated PWHT of mill coupons should be on the purchase order when the shop cycle is known.
Do not copy a SA387 Gr.22 Cl.2 or SA517 Gr.Q procedure onto ASME SA299 Grade A. The fabricator owns the WPS.
Heat Treatment
Plates 50 mm and under are normally supplied as-rolled. They may be ordered normalized, stress-relieved, or both.
Plates over 50 mm are normally normalized.
As-rolled thick plate is not the default for SA299 Grade A above 50 mm. SHH STEEL reports the actual delivery condition on the MTC.
Delivery Condition
Usual delivery is as-rolled to 50 mm and normalized above 50 mm, unless the order says otherwise.
The certificate lists ASME SA299 Grade A and, when dual certified, ASTM A299 Grade A; heat number; heat analysis; product analysis when ordered; tensile results by thickness line; heat-treatment condition; and supplementary tests.
Certificates may be EN 10204 3.1 or EN 10204 3.2.
Dimensions
Usual supply range from SHH STEEL for SA299 Gr.A Mn-Si vessel plate:
- Thickness: 8 mm – 150 mm
- Width: up to about 4000 mm
- Length: up to about 12000 mm
State thickness clearly. At 25 mm the yield line changes. At 50 mm the usual heat-treatment practice changes.
Tolerances
Dimensional limits follow ASME SA-20. UT to A435 or A578 is added when specified.
Supplementary Requirements
Most export ASME SA299 Grade A orders add extras. SHH STEEL does not assume them.
Simulated PWHT. Same-heat coupons follow the vessel cycle.
Charpy details. Temperature, energy and location as agreed.
NDE. UT to A435 / A577 / A578.
Restricted chemistry. Tighter P, S or residuals.
HIC / NACE. Only when cited.
Z-direction. A770 or Z15/Z25/Z35 when written.
Third-party. EN 10204 3.2.
Equivalent Material Grades
| Designation | Standard | Notes |
|---|---|---|
| ASME SA299 Grade A / SA299 Gr.A / SA299GRA | ASME SA-299/SA-299M | Code name on this page |
| ASTM A299 Grade A / A299 Gr.A / A299GRA | ASTM A299/A299M | Companion spec |
| ASME SA299 Grade B | SA-299 | Higher strength in the same spec |
| EN 10028-2 P355GH related | EN | Project comparison only |
| JIS G3118 SGV450 / SGV410 related | JIS | Japanese PV comparison |
| GB/T 713 Q370R related | GB | Confirm chemistry and tensile |
For stamping, write ASME SA299 Grade A or dual SA299 / A299 Grade A. Nearby pages: A203 Gr.A, A302 Gr.B, A537CL1.
Applications
| Industry | Typical components |
|---|---|
| Boilers | ASME SA299 Grade A drums and SA299GRA shells |
| Petrochemical | SA-299 Grade A process vessels |
| Energy | ASME SA299 Grade A Mn-Si vessel plate |
| Dual-certified export | SA299 / A299 Gr.A plate |
| Fabrication | SA299GRA cut to nest sizes |
Do not use this grade as a silent stand-in for SA203 Gr.D or SA517 Gr.S.
Why Choose SHH STEEL
SHH STEEL works as a China Mill Direct Exporter for plates to ASME SA-299/SA-299M. On ASME SA299 Grade A that means mill pricing, dual SA299/A299 marking, thickness-correct carbon and manganese bands at 25 mm, as-rolled or normalized delivery recorded on the MTC, 3.1 as standard and 3.2 when specified.
We keep the order on the right specification. Grade A is not Grade B. SA299 is not SA516 Gr.55. SA299 is not SA285 Gr.A. If the drawing wants fine-grain impact-tested carbon, we point the inquiry to SA516. If it wants nickel low-temp, we point it to SA203.
Company scope: China steel Mill Agent-SHH STEEL.
FAQ
- What names are used for ASME SA299 Grade A?Buyers write SA299 Gr.A, SA299GRA, SA299 GR A, SA-299 Grade A, ASME SA299 GR.A, ASME SA299GRA, ASTM A299 Grade A and A299GRA. SHH STEEL prints the wording on the purchase order.
- Is ASME SA299 Grade A the same as ASTM A299 Grade A?Chemistry and tensile limits match. ASME SA-299 is the Code version. ASTM A299 is the product spec. As China mill-Direct Supply, SHH STEEL dual-certifies SA299 Gr.A / A299 Gr.A when the vessel must be stamped.
- What is the yield strength of SA299 Gr.A?290 MPa through 25 mm. 275 MPa over 25 mm. Tensile is 515–655 MPa at all thicknesses, per ASME SA-299.
- Why specify Grade A instead of Grade B?Grade B is 550–690 MPa tensile with higher carbon and higher yield. Follow the grade on the drawing.
- Is SA299GRA the same as SA516 Gr.70 or SA515 Gr.70?No. Those are different carbon vessel specifications. ASME SA299 Grade A is C-Mn-Si plate under SA-299.
- Is heat treatment mandatory for SA299 Gr.A?Plates over 50 mm are normally normalized. Plates 50 mm and under are usually as-rolled unless ordered normalized or stress-relieved.
- Can welding of SA299 Gr.A be qualified to ASME Section IX?Yes. Use a low-hydrogen WPS written for this Mn-Si carbon. The fabricator owns the procedure
- Can SHH STEEL issue EN 10204 3.2 on ASME SA299 Grade A?Yes. EN 10204 3.1 is standard. EN 10204 3.2 is arranged when written on the order.
- What is the density of SA299 Gr.A plate?7.85 g/cm³.
Conclusion
ASME SA299 Grade A Steel Plate is the manganese-silicon carbon vessel grade in ASME SA-299/SA-299M. Whether the inquiry says SA299 Gr.A, SA299GRA, ASME SA299 GR.A, ASME SA299GRA or A299 Grade A, SHH STEEL supplies plate with heat and product analysis, thickness-correct yield at 25 mm, as-rolled or normalized delivery, and EN 10204 3.1 or 3.2 certification.
As a China mill Distributor, SHH STEEL provides ASME SA299 Grade A / SA299 Gr.A Mn-Si Vessel Plate for boilers and ASME Section VIII work.
Contact SHH STEEL for mill rolling, dual SA299/A299 marking, 3.2 inspection or a quotation.
ASME SA299 Grade A Steel Plate, SA299 Gr.A, SA299GRA, ASME SA299GRA, ASTM A299 Grade A, Mn-Si vessel plate, SA299 Grade A supplier, Direct Mill Supply by SHH STEEL
Quality Steel Needed? Inquire for Offers
