Astm A689
Basic Info
ASTM A689 is a specification that covers the standard requirements for carbon and alloy steel bars for springs, designed for various industrial applications. These steel bars are typically hot-wrought and subjected to heat treatment to achieve desired mechanical properties, such as tensile strength, yield strength, and hardness. ASTM A689 outlines specific chemical composition limits, heat treatment conditions, and dimensional tolerances to ensure consistent quality and performance of the finished products. This standard serves as a crucial guideline for manufacturers and users in the spring industry to produce and select appropriate steel bars that meet their specific requirements for spring applications.
Characteristics
Spring Steel Specification: ASTM A689 is specifically tailored for carbon and alloy steel bars used in the manufacturing of springs. This includes various types of springs such as coil springs, flat springs, and wire springs.
Heat Treatment Requirement: The standard specifies heat treatment processes such as annealing, normalizing, or tempering to achieve desired mechanical properties suitable for spring applications. Heat treatment helps enhance the material’s strength, hardness, and resilience.
Chemical Composition Limits: ASTM A689 outlines strict limits on the chemical composition of steel bars, including carbon, manganese, phosphorus, sulfur, and silicon. These limits ensure the material’s suitability for spring manufacturing and performance.
Quality Assurance: ASTM A689 ensures quality assurance by setting stringent requirements for manufacturing processes, testing procedures, and documentation. This helps manufacturers produce reliable and high-quality spring steel bars that meet industry standards and customer expectations.
ASTM A689 Data Sheet
Steel Grade
Dimensions and Tolerances
Equivalent Steel Grades
Chemical Composition
Mechanical Properties
Fabrication and Welding
Steel Grade
Grade 1050:
- Carbon steel with moderate tensile strength
Grade 1070:
- Carbon steel with higher tensile strength
Grade 1095:
- High-carbon steel with excellent hardness
Grade 6150:
- Chromium-vanadium alloy steel for higher strength
Grade 9260:
- Silicon-manganese spring steel with good yield strength
Dimensions and Tolerances
Round Bars
- Dimensions: Diameter, Length
- Tolerances:
Diameter: ±0.005 inches (±0.13 mm)
Length: ±1 inch (±25.4 mm)
Square Bars
- Dimensions: Width, Thickness, Length
- Tolerances:
Width: ±0.005 inches (±0.13 mm)
Thickness: ±0.005 inches (±0.13 mm)
Length: ±1 inch (±25.4 mm)
Hexagonal Bars
- Dimensions: Across Flats, Length
- Tolerances:
Across Flats: ±0.005 inches (±0.13 mm)
Length: ±1 inch (±25.4 mm)
Flat Bars
- Dimensions: Width, Thickness, Length
- Tolerances:
Width: ±0.005 inches (±0.13 mm)
Thickness: ±0.005 inches (±0.13 mm)
Length: ±1 inch (±25.4 mm)
Equivalent Steel Grades
United States
- Equivalent Steel Grade(s): AISI/SAE 1050, AISI/SAE 1070, AISI/SAE 1095, AISI/SAE 6150
- Standard: ASTM A689
European Union
- Equivalent Steel Grade(s): EN 10083-2 C50, EN 10083-2 C60, EN 10083-2 C67, EN 10083-3 51CrV4
- Standard: EN 10083-2, EN 10083-3
Japan
- Equivalent Steel Grade(s): JIS G4051 S50C, JIS G4051 S60C, JIS G4051 S65C, JIS G4801 SUP10
- Standard: JIS G4051, JIS G4801
China
- Equivalent Steel Grade(s): GB/T 711 50, GB/T 711 60, GB/T 711 67, GB/T 3077 50CrV4
- Standard: GB/T 711, GB/T 3077
Chemical Composition
Grade 1050
- Carbon (C): 0.48-0.55%
- Manganese (Mn): 0.60-0.90%
- Phosphorus (P): 0.040% max
- Sulfur (S): 0.050% max
- Silicon (Si): 0.15-0.35%
Grade 1070
- Carbon (C): 0.65-0.75%
- Manganese (Mn): 0.60-0.90%
- Phosphorus (P): 0.040% max
- Sulfur (S): 0.050% max
- Silicon (Si): 0.15-0.35%
Grade 1095
- Carbon (C): 0.90-1.03%
- Manganese (Mn): 0.30-0.50%
- Phosphorus (P): 0.035% max
- Sulfur (S): 0.045% max
Grade 6150
- Carbon (C): 0.48-0.53%
- Manganese (Mn): 0.60-0.90%
- Phosphorus (P): 0.035% max
- Sulfur (S): 0.040% max
- Silicon (Si): 0.15-0.35%
- Chromium (Cr): 0.80-1.10%
- Vanadium (V): 0.15-0.35%
Grade 9260
- Carbon (C): 0.56-0.64%
- Manganese (Mn): 0.75-1.00%
- Phosphorus (P): 0.035% max
- Sulfur (S): 0.040% max
- Silicon (Si): 1.80-2.20%
Mechanical Properties
Grade 1050
- Tensile Strength (MPa): 620-925
- Yield Strength (MPa): 410-725
- Elongation (%): 10 (min)
- Hardness (HRC): 88 (min)
Grade 1070
- Tensile Strength (MPa): 690-1035
- Yield Strength (MPa): 460-815
- Elongation (%): 8 (min)
- Hardness (HRC): 90 (min)
Grade 1095
- Tensile Strength (MPa): 725-1075
- Yield Strength (MPa): 500-885
- Elongation (%): 7 (min)
- Hardness (HRC): 92 (min)
Grade 6150
- Tensile Strength (MPa): 825-1230
- Yield Strength (MPa): 570-1035
- Elongation (%): 6 (min)
- Hardness (HRC): 93 (min)
Grade 9260
- Tensile Strength (MPa): 980-1225
- Yield Strength (MPa): 690-1035
- Elongation (%): 5 (min)
- Hardness (HRC): 94 (min)
Fabrication and Welding
Grade 1050
- Tensile Strength (MPa): 620-925
- Yield Strength (MPa): 410-725
- Elongation (%): 10 (min)
- Hardness (HRC): 88 (min)
Grade 1070
- Tensile Strength (MPa): 690-1035
- Yield Strength (MPa): 460-815
- Elongation (%): 8 (min)
- Hardness (HRC): 90 (min)
Grade 1095
- Tensile Strength (MPa): 725-1075
- Yield Strength (MPa): 500-885
- Elongation (%): 7 (min)
- Hardness (HRC): 92 (min)
Grade 6150
- Tensile Strength (MPa): 825-1230
- Yield Strength (MPa): 570-1035
- Elongation (%): 6 (min)
- Hardness (HRC): 93 (min)
Grade 9260
- Tensile Strength (MPa): 980-1225
- Yield Strength (MPa): 690-1035
- Elongation (%): 5 (min)
- Hardness (HRC): 94 (min)
