Spherical ASTM A442 Carbon Steel Powder, Grade 55

ASTM A442 Carbon Steel Spherical Powder, Grade 55 Product Information -:- For detailed product information, please contact sales. -: ASTM A442 Carbon Steel Spherical Powder, Grade 55 Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical ASTM A442 Carbon Steel Powder, Grade 55 characteristics -:- For detailed product information, please contact sales. -: Spherical ASTM A442 Carbon Steel Powder, Grade 55 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 A442 Carbon Steel Powder, Grade 55 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 A442 Carbon Steel Powder, Grade 55 Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: ASTM A442 Carbon Steel, Grade 55 Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ASTM A442 Grade 55 Carbon Steel Plate** **ASTM A442 Grade 55** is a **carbon-manganese-silicon steel plate** specifically designed for **welded pressure vessels and structural applications requiring improved notch toughness**. Designated as a **"notch-tough" steel**, this grade represents an evolution from basic carbon steels, offering enhanced resistance to brittle fracture at lower temperatures without requiring alloying elements like chromium or molybdenum. The "Grade 55" designation refers to its minimum yield strength of 55 ksi (380 MPa), placing it between conventional carbon steels and higher-strength alloy grades. --- ## **1. Key International Standards** * **Primary Material Standard:** **ASTM A442/A442M** - Standard Specification for Pressure Vessel Plates, Carbon Steel, Improved Transition Properties * **Common Supplementary Standards:** * **ASTM A20/A20M:** General Requirements for Steel Plates for Pressure Vessels * **ASME Section II, Part A:** Adopted as **SA-442 Grade 55** in the ASME Boiler and Pressure Vessel Code * **ISO 9328-2:** Steel flat products for pressure purposes - Part 2: Non-alloy and alloy steels with specified elevated temperature properties * **Related National Standards:** * **EN 10028-2:** P275GH (similar application but different strength) * **JIS G3115:** SPV355 (Japanese pressure vessel steel) --- ## **2. Chemical Composition (Weight %, ASTM A442)** | Element | Composition (%) | Metallurgical Function | |---------|----------------|------------------------| | Carbon (C) | 0.24 max | Primary strengthener, controlled for weldability | | Manganese (Mn) | 0.85-1.20 | Enhances strength and hardenability, improves toughness | | Phosphorus (P) | 0.035 max | Impurity control (embrittlement) | | Sulfur (S) | 0.040 max | Impurity control (hot shortness) | | Silicon (Si) | 0.15-0.30 | Deoxidizer, strengthens ferrite, improves cleanliness | | Copper (Cu) | 0.35 max (when specified) | Optional for improved atmospheric corrosion resistance | *Note: The balanced C-Mn-Si composition provides good strength while maintaining adequate notch toughness through microstructural control.* ### **Key Composition Features:** - **Lower carbon content** than traditional pressure vessel steels (≤0.24% vs. typical 0.30%) - **Higher manganese-to-carbon ratio** (Mn/C ≥ 3.5) for improved toughness - **Silicon range** optimized for deoxidation without excessive hardening - **Sulfur and phosphorus limits** tighter than standard carbon steels --- ## **3. Mechanical & Physical Properties** ### **Minimum Mechanical Properties:** - **Tensile Strength:** **450-585 MPa** (65,000-85,000 psi) - **Yield Strength (0.2% offset, min):** **380 MPa** (55,000 psi) - **Elongation in 2 in. (50 mm):** **22% minimum** (higher than many comparable grades) - **Reduction of Area:** Typically 40-55% ### **Notch Toughness Requirements (Key Differentiator):** - **Charpy V-Notch Impact Test:** Required - **Test Temperature:** Typically specified at **0°C (32°F)** or higher - **Minimum Absorbed Energy:** **20 J (15 ft-lb)** minimum average of three specimens - **Individual Minimum:** No single value less than 17 J (12.5 ft-lb) ### **Physical Properties:** | Property | Value | Conditions | |----------|-------|------------| | Density | 7.85 g/cm³ (0.284 lb/in³) | Room temperature | | Modulus of Elasticity | 200 GPa (29×10⁶ psi) | Room temperature | | Shear Modulus | 77 GPa (11.2×10⁶ psi) | Room temperature | | Poisson's Ratio | 0.29 | - | | Coefficient of Thermal Expansion | 11.7×10⁻⁶/°C | 20-100°C | | Thermal Conductivity | 50-52 W/m·K | 100°C | | Specific Heat | 450-470 J/kg·K | 100°C | ### **Heat Treatment Condition:** - Typically supplied in **normalized condition** (required for thicknesses >50 mm) - May be supplied as-rolled for thinner sections - Normalizing temperature: 900-925°C (1650-1700°F) --- ## **4. Key Characteristics & Advantages** ### **Enhanced Toughness (Primary Feature):** - **Improved Transition Temperature:** Lower ductile-to-brittle transition temperature than conventional carbon steels - **Consistent Impact Properties:** Guaranteed notch toughness through specification requirements - **Microstructural Benefits:** Fine-grained ferrite-pearlite structure from controlled processing ### **Strength & Fabricability Balance:** - **Moderate Strength Level:** 55 ksi yield provides good strength-to-weight ratio - **Excellent Weldability:** Low carbon equivalent (typically 0.35-0.42) allows easier welding than higher-strength steels - **Good Formability:** Can be cold formed within reasonable limits - **Machinability:** Approximately 70% of free-cutting steel (1212) ### **Economic Advantages:** - **Cost-Effective:** More economical than alloy steels with similar toughness - **Availability:** Readily available in standard sizes and thicknesses - **Simplified Fabrication:** Lower preheat requirements than alloy steels ### **Limitations:** - **Maximum Temperature Service:** Limited to approximately 400°C (750°F) - **Corrosion Resistance:** Similar to carbon steel unless copper-bearing version specified - **Strength Limitations:** Lower than quenched & tempered or alloy steels --- ## **5. Product Applications** ### **Pressure Vessels (Primary Application):** - **Low to Medium Pressure Storage Tanks:** - Propane and butane storage vessels - Compressed air receivers - Industrial gas storage tanks - Water treatment pressure vessels - **Process Vessels:** - Chemical reactors operating at moderate temperatures - Distillation columns and towers - Heat exchanger shells and channels - Separators and scrubbers ### **Structural Applications:** - **Heavy Equipment Components:** - Crane booms and structural members - Excavator frames and arms - Mining equipment structures - **Marine & Offshore:** - Barge construction - Offshore platform secondary structures - Ship bulkheads and decks - **Construction Equipment:** - Concrete pump booms - Crane attachments - Heavy-duty trailer frames ### **Special Applications Requiring Toughness:** - **Cold Climate Equipment:** For operation in sub-freezing temperatures - **Impact-Resistant Structures:** Where shock loading is anticipated - **Fatigue-Critical Components:** Where notch sensitivity is a concern --- ## **6. Manufacturing & Quality Control** ### **Steelmaking Process:** - **Primary Method:** Basic oxygen or electric arc furnace - **Deoxidation Practice:** Fully killed with silicon (and possibly aluminum) - **Grain Refinement:** Aluminum treatment may be used for grain size control - **Inclusion Control:** Modern ladle metallurgy practices ### **Quality Assurance Tests:** 1. **Chemical Analysis:** Ladle and product analysis 2. **Tensile Testing:** Longitudinal and transverse directions 3. **Impact Testing:** Charpy V-notch at specified temperature 4. **Bend Testing:** For weld qualification 5. **Ultrasonic Testing:** Optional for critical applications 6. **Hardness Testing:** To verify heat treatment --- ## **7. Fabrication Guidelines** ### **Welding Procedures:** #### **Preheat Requirements:** | Thickness | Minimum Preheat Temperature | |-----------|-----------------------------| | ≤19 mm (¾ in) | Generally not required | | 19-38 mm (¾-1½ in) | 50-100°C (120-210°F) | | >38 mm (>1½ in) | 100-150°C (210-300°F) | #### **Recommended Filler Metals:** - **SMAW:** E7018, E7016 (low hydrogen electrodes essential) - **FCAW:** E71T-1, E70T-1 - **GMAW:** ER70S-6, ER70S-3 - **SAW:** F7A2-EM12K, F7A0-EH14 #### **Post-Weld Heat Treatment:** - **Generally not required** for thicknesses ≤32 mm (1¼ in) - **Recommended** for thicknesses >32 mm or highly restrained joints - **Temperature:** 590-650°C (1100-1200°F) - **Time:** 1 hour per inch of thickness, minimum 1 hour ### **Forming & Machining:** - **Cold Forming:** Minimum bend radius typically 2× thickness - **Hot Forming:** Temperature range 900-1100°C (1650-2010°F) - **Machining:** Use positive rake tools, adequate cooling/lubrication - **Shearing:** Suitable for thicknesses up to 25 mm (1 in) --- ## **8. Comparison with Similar Grades** ### **ASTM A442 Grade 55 vs. ASTM A516 Grade 55:** | Parameter | A442 Grade 55 | A516 Grade 55 | Advantage | |-----------|---------------|---------------|-----------| | **Primary Purpose** | General pressure vessels with toughness | Pressure vessels for moderate/low temps | A516 more common | | **Impact Testing** | Always required | May be waived | A442 more consistent | | **Carbon Content** | ≤0.24% | ≤0.25% | Similar | | **Manganese Range** | 0.85-1.20% | 0.85-1.20% | Similar | | **Typical Cost** | Slightly higher | Most economical | A516 cheaper | ### **ASTM A442 Grade 55 vs. ASTM A36:** | Parameter | A442 Grade 55 | A36 | Advantage | |-----------|---------------|-----|-----------| | **Yield Strength** | 380 MPa (55 ksi) | 250 MPa (36 ksi) | A442 52% stronger | | **Toughness** | Guaranteed | Not specified | A442 much better | | **Applications** | Pressure vessels | General structure | Different purposes | | **Cost Premium** | 20-40% higher | Baseline | A36 cheaper | ### **International Comparison:** | Country | Equivalent Standard | Grade | Key Differences | |---------|---------------------|-------|----------------| | **European Union** | EN 10028-2 | P275GH | Lower strength (275 MPa yield) | | **Japan** | JIS G3115 | SPV355 | Similar strength, different toughness requirements | | **China** | GB 713 | Q345R | Similar but with different chemical limits | | **International** | ISO 9328-2 | P275GH | European harmonized standard | --- ## **9. Design Considerations** ### **Pressure Vessel Design:** - **Allowable Stress:** Based on ASME Section VIII, Division 1 - **Design Temperature:** Maximum ~400°C (750°F) - **Joint Efficiency:** Dependent on examination level - **Corrosion Allowance:** Typically 1.5-3.0 mm (1/16-1/8 in) ### **Structural Design:** - **Allowable Stress:** Per applicable structural codes (AISC, etc.) - **Fatigue Considerations:** Improved over conventional carbon steels - **Connection Design:** Both welded and bolted connections suitable - **Stability Considerations:** Higher strength allows lighter sections ### **Temperature Limitations:** - **Minimum Design Temperature:** Down to -30°C (-20°F) with proper toughness testing - **Maximum Design Temperature:** ~400°C (750°F) for long-term service - **Creep Considerations:** Not suitable for sustained loading above 375°C (700°F) --- ## **10. Quality Standards & Certification** ### **Testing Requirements:** - **Heat Analysis:** Required for each heat of steel - **Product Analysis:** May be required from finished product - **Mechanical Tests:** One set per plate as-rolled, per heat if normalized - **Impact Tests:** One set per heat-treatment charge ### **Certification:** - **Mill Test Certificate:** To ASTM A20 requirements - **Traceability:** Complete from melt to finished product - **Heat Treatment Records:** Required if normalized - **Non-Destructive Testing Reports:** If specified ### **Marking Requirements:** - ASTM designation - Grade - Heat number - Manufacturer's identification - Size and weight --- **Technical Summary:** ASTM A442 Grade 55 represents a well-balanced carbon-manganese steel offering improved toughness over conventional carbon steels while maintaining good weldability and formability. Its guaranteed notch toughness properties make it suitable for pressure vessel and structural applications where resistance to brittle fracture is important, particularly in moderate temperature ranges. While largely superseded by more specialized grades in many applications, it remains a viable choice for specific applications requiring its particular combination of properties. The grade's primary advantage lies in its cost-effectiveness for applications requiring better toughness than standard carbon steel but not requiring the elevated temperature capabilities or higher strength of alloy steels. Proper fabrication practices, particularly regarding welding and heat treatment, are essential to maintain its inherent toughness properties in finished components. -:- For detailed product information, please contact sales. -: ASTM A442 Carbon Steel, Grade 55 Specification Dimensions Size： Diameter 20-1000 mm Length <6010 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 A442 Carbon Steel, Grade 55 Properties -:- For detailed product information, please contact sales. -:

Spherical ASTM A442 Carbon Steel Powder, Grade 55 Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical ASTM A442 Carbon Steel Powder, Grade 55 -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of ASTM A442 Carbon Steel Spherical Powder, Grade 55 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A442 Carbon Steel Spherical Powder, Grade 55 -:- For detailed product information, please contact sales. -:

Packing of ASTM A442 Carbon Steel Spherical Powder, Grade 55 -:- 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 2481 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