ASTM A434
Basic Info
ASTM A434 provides standards for steel bars and alloy steel plates, detailing their quality, conditions, and suitability for various structural and machine applications. This standard is vital for industries that require steel bars and plates with specific properties such as hardness, toughness, and wear resistance for use in critical components.
Characteristics
High Strength: A434 steel bars and plates are designed for high-strength applications, offering exceptional mechanical properties.
Hardness: This steel can achieve high hardness levels through proper heat treatment, suitable for wear-resistant parts.
Toughness: A434 steel maintains toughness even with increased hardness, important for parts subjected to impact.
Corrosion Resistance: Some A434 grades are alloyed for improved corrosion resistance, enhancing durability.
ASTM A434 Data Sheet
Dimensions and Tolerances
Equivalent Steel Grades
Chemical Composition
Mechanical Properties
Fabrication and Welding
Dimensions and Tolerances
Round Bar:
- Tolerances: Diameter 12.7mm to 350mm
Square Bar:
- Tolerances: Size 12.7mm to 100mm
Flat Bar:
- Width Range: 20-300mm
- Thickness Range: 3-100mm
- Tolerances: Width ±1mm, Thickness ±0.3mm to ±0.5mm
Hexagonal Bar:
- Tolerances: Across Flats 13mm to 46mm
Billet:
- Tolerances: Size 100mm to 300mm
Equivalent Steel Grades
Steel Grade: ASTM A434
- Germany: DIN EN 10083
- Japan: JIS G4105
- China: GB/T 3077
Chemical Composition
Steel Grade: A434
- C (%): 0.40 – 0.50
- Mn (%): 0.60 – 0.90
- P (%): 0.035 (max)
- S (%): 0.040 (max)
- Si (%): 0.15 – 0.35
- Cr (%): 0.70 – 1.00
- Mo (%): 0.20 – 0.30
Mechanical Properties
Steel Grade: A434
- Tensile Strength (MPa): 785 min
- Yield Strength (MPa): 620 min
- Elongation (%): 13 min
- Reduction of Area (%): 45 min
- Hardness (HB): 248 max
Fabrication and Welding
Steel Grade: A434
- Preheat (°C): 200–400
- Interpass Temp (°C): —
- Post Weld Heat Treatment (PWHT): Optional
- Welding Processes: SMAW, GTAW, GMAW
- Welding Recommendations: Preheating recommended for thicker sections. Control heat input. PWHT optional depending on material thickness and application. Use low hydrogen electrodes for SMAW.
ASTM A434: Engineered for Strength, Built for Reliability
ASTM A434 materials stand out in the industry for their exceptional blend of high strength and toughness, making them an ideal choice for applications that demand reliability under extreme conditions. With tensile strengths ranging from 785 MPa and above, these steels provide the durability needed in critical components across various industries. What sets A434 apart is not just its strength but also its ability to maintain toughness even at elevated strength levels.
For industries like automotive and aerospace, where weight reduction is key without compromising structural integrity, ASTM A434 offers solutions that meet stringent performance requirements. The materials excel in withstanding dynamic loads, making them vital for gears, shafts, and other components subjected to heavy stresses. Moreover, their excellent impact resistance ensures longevity and safety in critical parts.
Customers seeking materials that can endure harsh environments while maintaining performance and safety standards find ASTM A434 an attractive option. Whether it’s for high-performance engines, heavy machinery, or precision components, A434 materials provide the strength and toughness needed to exceed expectations. Choosing ASTM A434 means selecting a proven standard that ensures the reliability and longevity of your products.
