Spherical ASTM A202 Low Alloy Steel Powder, Grade B

ASTM A202 Low Alloy Steel Spherical Powder, Grade B Product Information -:- For detailed product information, please contact sales. -: ASTM A202 Low Alloy Steel Spherical Powder, Grade B Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical ASTM A202 Low Alloy Steel Powder, Grade B characteristics -:- For detailed product information, please contact sales. -: Spherical ASTM A202 Low Alloy Steel Powder, Grade B Particle Size -:- For detailed product information, please contact sales. -: -:- -:- 0-15μm ,5-25μm, 15-45μm, 15-53μm,20-63um, 45-75μm, 45-105μm, 45-150μm ,75-150μm. (Various granularities can be customized according to customer requirements) -:- For detailed product information, please contact sales. -:

Spherical ASTM A202 Low Alloy Steel Powder, Grade B Applicable processes -:- For detailed product information, please contact sales. -: Laser/electron beam additive manufacturing (SLM/EBM, 3D printing) Direct laser deposition (DLD) Used in thermal spray (TSA) Powder hot isostatic pressing (HIP) Metal injection molding (MIM) Powder metallurgy (PM) Laser cladding (LC), etc. -:- For detailed product information, please contact sales. -: Spherical ASTM A202 Low Alloy Steel Powder, Grade B Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: ASTM A202 Low Alloy Steel, Grade B Product Information -:- For detailed product information, please contact sales. -: ## **Product Overview: ASTM A202 Grade B Low-Alloy Structural Steel Plate** **ASTM A202 Grade B** is a premium **chromium-manganese-silicon low-alloy steel** plate designed for **high-strength pressure vessel applications** where superior mechanical properties and enhanced atmospheric corrosion resistance are critical requirements. As the higher-strength variant within the ASTM A202 specification (*Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Manganese-Silicon*), Grade B provides substantially increased yield and tensile strength compared to Grade A through optimized alloy composition and normalized heat treatment. This grade represents an economical alternative to lower-alloy chromium-molybdenum steels for moderate temperature service. --- ## **Key International Standards & Specifications** * **Primary Standard:** **ASTM A202/A202M** - Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Manganese-Silicon * **ASME Code Equivalent:** **SA-202/SA-202M Grade B** (ASME Boiler and Pressure Vessel Code Section II) * **European Comparable Standards:** - **EN 10028-2:** P460NH (similar strength level, different chemical approach) - **EN 10025-4:** S460N (structural steel equivalent, not pressure vessel rated) * **Japanese Standard:** **JIS G3119 SB480** (closest commercial equivalent) * **Key Distinction:** Unlike general structural grades, ASTM A202 B is specifically produced, tested, and certified for pressure equipment under stringent quality control systems. --- ## **Chemical Composition (% by Weight, ASTM A202 Grade B)** | Element | Composition Range | Function & Metallurgical Impact | |---------|-------------------|--------------------------------| | **Carbon (C)** | 0.20 - 0.27% | Primary strengthening element; provides core strength through carbide formation | | **Manganese (Mn)** | 1.20 - 1.60% | Enhances hardenability, refines grain structure, contributes solid solution strengthening | | **Phosphorus (P)** | ≤ 0.035% | Residual impurity; controlled to minimize temper embrittlement | | **Sulfur (S)** | ≤ 0.040% | Controlled for improved hot workability and reduced anisotropy | | **Silicon (Si)** | 0.50 - 0.80% | Deoxidizer, increases strength through solid solution, improves scaling resistance | | **Chromium (Cr)** | 0.40 - 0.65% | Enhances corrosion/oxidation resistance, contributes to hardenability | | **Nickel (Ni)** | ≤ 0.25% (residual) | Optional for improved toughness | | **Copper (Cu)** | ≤ 0.35% (optional) | Specified for enhanced atmospheric corrosion resistance | **Note:** Chemical composition may vary slightly with plate thickness. Thicker sections (>100mm) may require tighter composition control. --- ## **Mechanical & Physical Properties** ### **Tensile Properties (Normalized Condition)** | Property | Minimum Requirement | Typical Range | Test Standard | |----------|---------------------|---------------|---------------| | **Yield Strength (0.2% offset)** | 60 ksi (415 MPa) | 62-70 ksi (425-485 MPa) | ASTM A370 | | **Tensile Strength** | 85 ksi (585 MPa) | 90-100 ksi (620-690 MPa) | ASTM A370 | | **Elongation (8-inch gauge)** | 16% | 18-22% | ASTM A370 | | **Elongation (2-inch gauge)** | 19% | 21-25% | ASTM A370 | ### **Impact Properties (When Specified)** | Condition | Test Temperature | Minimum Absorbed Energy | Notes | |-----------|-----------------|-------------------------|-------| | **Charpy V-Notch** | +20°C (68°F) | 27 J (20 ft-lb) | Typically specified | | **Optional Low Temp** | 0°C (32°F) | 20 J (15 ft-lb) | By agreement | ### **Physical Constants** - **Density:** 7.85 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity:** 29,000 ksi (200 GPa) at room temperature - **Poisson's Ratio:** 0.29 - **Coefficient of Thermal Expansion:** 11.5 × 10⁻⁶/°C (20-100°C) - **Thermal Conductivity:** 48 W/m·K at 100°C --- ## **Heat Treatment & Microstructure** **Standard Condition:** Normalized - **Normalizing Temperature:** 900-950°C (1650-1740°F) - **Cooling Method:** Still air cooling - **Resulting Microstructure:** Fine-grained ferrite-pearlite with possible bainitic transformation products - **Grain Size:** ASTM 6 or finer (typical) **Post-Weld Heat Treatment (PWHT):** - Recommended for stress relief of welded structures - Temperature range: 595-650°C (1100-1200°F) - Holding time: 1 hour per inch of thickness (minimum) --- ## **Product Applications** ### **Primary Pressure Vessel Applications** 1. **Power Generation Equipment** - Boiler drums and shells - High-pressure heat exchangers - Steam separators and accumulators - Fossil fuel power plant components 2. **Petrochemical & Refining** - Reactor vessels (moderate temperature service) - Distillation columns - Process separators operating at 300-425°C (570-800°F) - Gas scrubbers and absorbers 3. **Industrial Processing** - Pulp digesters in paper manufacturing - Chemical processing reactors - High-pressure storage vessels for gases and liquids - Industrial autoclaves ### **Special Applications** - **Structural components in corrosive environments** where enhanced atmospheric corrosion resistance is needed - **High-strength plate girders** in aggressive industrial atmospheres - **Support structures** for elevated temperature equipment --- ## **Fabrication Characteristics** ### **Weldability** - **Carbon Equivalent (CE):** 0.45-0.55% (IIW formula) - **Recommended Welding Processes:** SMAW, SAW, GMAW, FCAW - **Preheat Temperature:** 150-200°C (300-400°F) for thickness > 25mm - **Interpass Temperature:** ≤ 250°C (480°F) - **Consumables:** AWS E10018, E11018, or equivalent ### **Forming & Machining** - **Hot Forming:** Recommended above 850°C (1560°F) - **Cold Forming:** Possible with adequate radius (≥ 3× thickness) - **Machinability:** 65% of AISI 1212 steel (relative rating) - **Cutting Methods:** Oxy-fuel, plasma, laser, and waterjet suitable --- ## **Comparative Advantages** | Aspect | ASTM A202 Grade B | Competitive Grades | |--------|-------------------|-------------------| | **Strength-Cost Ratio** | Excellent | Better than Cr-Mo steels, higher than carbon steels | | **Corrosion Resistance** | 2× carbon steel | Superior to A516, comparable to weathering steels | | **High-Temp Strength** | Good to 425°C | Better than carbon steels, below Cr-Mo alloys | | **Weldability** | Good with precautions | More challenging than A516, easier than some Cr-Mo grades | | **Availability** | Readily available | Standard mill product with 4-8 week lead time | --- ## **Quality Assurance & Testing** ### **Mandatory Testing (per ASTM A202)** 1. **Chemical Analysis:** Heat analysis and product verification 2. **Tensile Testing:** One test per plate or 50 tons (whichever is less) 3. **Dimensional Verification:** Thickness, width, length, and straightness ### **Optional Supplementary Tests** - **Charpy V-Notch Impact Testing** (when specified) - **Ultrasonic Examination** to ASTM A578 Level II or III - **Hardness Testing** (typically 180-220 HB) - **Flattening Test** for as-rolled edges ### **Certification & Documentation** - Mill Test Certificate (MTC) with heat number traceability - ASME Material Certificate for code construction - Optional EN 10204 3.1/3.2 certification for European projects --- ## **Limitations & Special Considerations** 1. **Temperature Limits:** - Maximum design temperature: 425°C (800°F) - Minimum design temperature: -30°C (-20°F) with impact testing 2. **Hydrogen Service:** Not recommended for severe wet H₂S service without special evaluation 3. **Thickness Limitations:** Typically available up to 150mm (6 inches), but properties diminish above 100mm 4. **Post-Weld Considerations:** Mandatory PWHT for thickness > 35mm in pressure applications --- ## **Environmental & Sustainability Aspects** - **Recyclability:** 100% recyclable with no degradation of properties - **Lifecycle:** Extended service life due to corrosion resistance reduces replacement frequency - **Manufacturing:** Lower alloy content than Cr-Mo steels reduces environmental impact - **Coating Requirements:** Often used uncoated in suitable environments, reducing maintenance --- ## **Conclusion** **ASTM A202 Grade B** represents an optimal balance between **performance, fabricability, and cost** for demanding pressure vessel applications. Its enhanced strength level (60 ksi yield minimum) combined with inherent corrosion resistance makes it particularly suitable for: 1. **High-pressure equipment** where weight reduction is advantageous 2. **Moderate temperature service** (up to 425°C/800°F) requiring scaling resistance 3. **Industrial environments** with corrosive atmospheres 4. **Applications** where the cost of chromium-molybdenum steels is not justified When specified with appropriate impact testing and fabricated according to established procedures, A202 Grade B provides reliable, long-term performance in critical pressure-containing equipment. Its continued use in power generation, petrochemical, and heavy industrial applications demonstrates its proven engineering value as a specialized intermediate-alloy pressure vessel steel. -:- For detailed product information, please contact sales. -: ASTM A202 Low Alloy Steel, Grade B Specification Dimensions Size： Diameter 20-1000 mm Length <5970 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: ASTM A202 Low Alloy Steel, Grade B Properties -:- For detailed product information, please contact sales. -:

Spherical ASTM A202 Low Alloy Steel Powder, Grade B Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical ASTM A202 Low Alloy Steel Powder, Grade B -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of ASTM A202 Low Alloy Steel Spherical Powder, Grade B -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A202 Low Alloy Steel Spherical Powder, Grade B -:- For detailed product information, please contact sales. -:

Packing of ASTM A202 Low Alloy Steel Spherical Powder, Grade B -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Spherical Powder drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 2441 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition