SA299 Steel Plate for Pressure Vessels (ASME)
SA299 is an American grade of carbon-manganese pressure vessel steel plate under the ASME standard. The manufacturing specification is ASME SA-299/SA-299M, and the ultrasonic testing standard is NB/T 47013.3-2015.
This grade is a carbon-manganese pressure vessel steel offering good strength and weldability. It is available in Grade A and Grade B, with Grade B providing higher tensile and yield strength. SA299 Approximate Grade Lookup Table.
SA299 steel plates are specifically designed for welded boilers and pressure vessels. The P and S content was changed from ≤0.035 to ≤0.025 in the 2017 version.
SA299 designation explanation: SA denotes ASME specification, 299 is the specification number, Grade A/B denotes different strength grades.
Product Overview
SA299 Steel Plate is an American grade of carbon-manganese pressure vessel steel manufactured in accordance with ASME SA-299/SA-299M. It contains carbon and manganese as primary alloying elements, providing good strength and weldability for welded boilers and pressure vessel applications.
This grade is available in Grade A (yield ≥290 MPa, tensile 515-655 MPa) and Grade B (yield ≥325 MPa, tensile 550-690 MPa). Both grades feature P and S content limited to ≤0.025% for improved cleanliness.
Core Advantages
- Two strength grades available (A and B)
- Low P/S content (≤0.025%) for improved cleanliness
- Good weldability for boiler and pressure vessel fabrication
- Thickness-dependent property adjustments
Professional Technical Support and Customization
Comprehensive Knowledge Base: Our sales team is proficient in mainstream domestic and international pressure vessel standards. Whether it's the American ASME standard SA299 or other international standards, we can provide accurate technical communication.
Zero Communication Errors: With solid product knowledge, we can avoid all basic errors during the order technical condition confirmation stage, ensuring the accuracy of your order.
Flexible Customization Capabilities: The SA299 standard specifies different C and Mn contents based on thickness and grade. If your design has special requirements (e.g., specific hardness, impact testing, HIC/SSC testing), we support customized production.
Applications
Stock Resources
Plates: 6-100mm+ (W:2000-2500, L:11000-12500)
Hot-rolled plates: 6-40mm (W:1800-2500, L:11000-12500)
Coils: 5-16mm (W:1500-2000)
Spot stock size range and supply conditions
Supply Condition: AR, CR, N
SA299 Chemical Composition (max %)
| Element | Thickness | Analysis Category | Value |
|---|---|---|---|
| C① | ≤lin.(25mm) | Grade A | ≤0.26 |
| >lin.(25mm) | Grade B | ≤0.28 | |
| ≤lin.(25mm) | Grade A | ≤0.28 | |
| >lin.(25mm) | Grade B | ≤0.30 | |
| Mn | ≤lin.(25mm) | smelting analysis | 0.90-1.40 |
| >lin.(25mm) | finished product analysis | 0.84-1.52 | |
| ≤lin.(25mm) | smelting analysis | 0.90-1.50 | |
| >lin.(25mm) | finished product analysis | 0.84-1.62 | |
| P① | - | ≤0.025* | |
| S① | - | ≤0.025* | |
| Si | Smelting Analysis | 0.15-0.40 | |
| Finished Product Analysis | 0.13-0.45 | ||
① Both smelting analysis and finished product analysis are applicable.
* The content of P and S was changed from ≤0.035 to ≤0.025 in the 2017 version.
SA299 - Alloying Elements and Roles
per ASME SA-299Influences strength and hardness. Grade A ≤0.26% (≤25mm) / ≤0.28% (>25mm), Grade B ≤0.28% (≤25mm) / ≤0.30% (>25mm).
Enhances strength and toughness. Smelting 0.90-1.40/1.50%, finished 0.84-1.52/1.62% depending on thickness.
Deoxidizer, increases strength. Smelting 0.15-0.40%, finished 0.13-0.45%.
Harmful element, reduces toughness. Changed from ≤0.035% to ≤0.025% in 2017 version.
Harmful element, causes hot shortness. Changed from ≤0.035% to ≤0.025% in 2017 version.
Grade A: Yield ≥290 MPa (≤25mm) / ≥275 MPa (>25mm), Tensile 515-655 MPa. Grade B: Yield ≥325 MPa (≤25mm) / ≥310 MPa (>25mm), Tensile 550-690 MPa.
SA299 Mechanical Properties
| Property | Thickness | Grade A | Grade B |
|---|---|---|---|
| Tensile Strength (MPa) | - | 515-655 | 550-690 |
| Yield Strength (MPa), ≥ | ≤lin.(25mm) | 290 | 325 |
| >lin.(25mm) | 275 | 310 | |
| Elongation (8in./200mm), % ② ≥ | - | 16 | 16 |
| Elongation (2in./50mm), % ② ≥ | - | 19 | 19 |
① The 0.2% residual deformation method or the 0.5% elongation under load method can be used for determination. ② For adjustments to elongation, please refer to the A20/A20M standard.
SA299 Grade A vs Grade B vs Q345R
| Item | SA299 Grade A | SA299 Grade B | Q345R |
|---|---|---|---|
| Standard | ASME SA-299 | ASME SA-299 | GB/T 713.2 |
| Yield Strength (≤25mm) | ≥290 MPa | ≥325 MPa | ≥345 MPa |
| Tensile Strength | 515-655 MPa | 550-690 MPa | 510-640 MPa |
| Elongation | ≥19% (2in.) / ≥16% (8in.) | ≥19% (2in.) / ≥16% (8in.) | ≥21% |
Scenario-Based Recommendation - Grade Comparison
SA299 Grade A
Tensile 515-655 MPa
SA299 Grade B
Tensile 550-690 MPa
Q345R
Charpy 0 C
Quality Control and Inspection
Customizable Specification Range for SA299
Delivery Condition
AR as rolled - CR controlled rolled - N normalized
Additional Requirements
- Simulated post-weld heat treatment (PWHT)
- Brinell hardness requirements
- HIC / SSC testing
- Impact testing per agreement
Other customized technical conditions are also negotiable.
The above ranges represent our standard customizing capability.
Frequently Asked Questions
What is SA299 steel plate used for?
SA299 steel plate is mainly used for boilers, pressure vessels, heat exchangers, storage tanks, boiler drums, and general pressure equipment manufactured under ASME standards.
What is the difference between Grade A and Grade B of SA299?
SA299 Grade B has higher yield strength (≥325 MPa vs ≥290 MPa for ≤25mm) and higher tensile strength (550-690 MPa vs 515-655 MPa). Grade B is suitable for higher strength requirements.
What is the P and S limit for SA299?
The P and S content is limited to ≤0.025% for SA299, which was changed from ≤0.035% in the 2017 version of the standard.
What is the delivery condition for SA299?
SA299 is typically delivered in as-rolled (AR), controlled rolled (CR), or normalized (N) condition.
Can you provide SA299 steel plates with custom sizes?
Yes. Custom rolling up to 100mm+ thick, 5200mm wide, 18000mm long. Delivery: 15-20 days hot-rolled, 30-35 days normalized.
Request a Quote
Emails go directly to customize@cehesteel.com - reply within 12h.