ASTM A 325 Structural Steel Bolts, Heat Treated

ASTM A325 Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength

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Chemical Requirements for Type 1 Bolts

Element Carbon Steel
Heat
Analysis		 Product
Analysis
Carbon 0.30–0.52 0.28–0.55
Manganese, min 0.60 0.57
Phosphorus, max 0.040 0.048
Sulfur, max 0.050 0.058
Silicon 0.15–0.30 0.13–0.32
Element Carbon Boron Steel
Heat
Analysis		 Product
Analysis
Carbon 0.30–0.52 0.28–0.55
Manganese, min 0.60 0.57
Phosphorus, max 0.040 0.048
Sulfur, max 0.050 0.058
Silicon 0.10–0.30 0.08–0.32
Boron 0.0005–0.003 0.0005–0.003
   
Element Alloy Steel
Heat
Analysis		 Product
Analysis
Carbon 0.30–0.52 0.28–0.55
Manganese, min 0.60 0.57
Phosphorus, max 0.035 0.040
Sulfur, max 0.040 0.045
Silicon 0.15–0.35 0.13–0.37
Alloying Elements A A
Element Alloy Boron Steel
Heat
Analysis		 Product
Analysis
Carbon 0.30–0.52 0.28–0.55
Manganese, min 0.60 0.57
Phosphorus, max 0.035 0.040
Sulfur, max 0.040 0.045
Silicon 0.15–0.35 0.13–0.37
Boron 0.0005–0.003 0.0005–0.003
Alloying Elements A A
   
A Steel, as defined by the American Iron and Steel Institute, shall be considered to be alloy when the maximum of the range given for the content of alloying elements exceeds one or more of the following limits: Manganese, 1.65 %; silicon, 0.60 %; copper, 0.60 % or in which a definite range or a definite minimum quantity of any of the following elements is specified or required within the limits of the recognized field of constructional alloy steels: aluminum, chromium up to 3.99 %, cobalt, columbium, molybdenum, nickel, titanium, tungsten, vanadium, zirconium, or any other alloying elements added to obtain a desired alloying effect.

Chemical Requirements for Type 3 Heavy Hex Structural Bolts A

Composition, %
Type 3 Bolts A
Element A B C D E F
Carbon:
    Heat analysis 0.33–0.40 0.38–0.48 0.15–0.25 0.15–0.25 0.20–0.25 0.20–0.25
    Product analysis 0.31–0.42 0.36–0.50 0.14–0.26 0.14–0.26 0.18–0.27 0.19–0.26
Manganese:
    Heat analysis 0.90–1.20 0.70–0.90 0.80–1.35 0.40–1.20 0.60–1.00 0.90–1.20
    Product analysis 0.86–1.24 0.67–0.93 0.76–1.39 0.36–1.24 0.56–1.04 0.86–1.24
Phosphorus:
    Heat analysis 0.035 max 0.06–0.12 0.035 max 0.035 max 0.035 max 0.035 max
    Product analysis 0.040 max 0.06–0.125 0.040 max 0.040 max 0.040 max 0.040 max
Sulfur:
    Heat analysis 0.040 max 0.040 max 0.040 max 0.040 max 0.040 max 0.040 max
    Product analysis 0.045 max 0.045 max 0.045 max 0.045 max 0.045 max 0.045 max
Silicon:
    Heat analysis 0.15–0.35 0.30–0.50 0.15–0.35 0.25–0.50 0.15–0.35 0.15–0.35
    Product analysis 0.13–0.37 0.25–0.55 0.13–0.37 0.20–0.55 0.13–0.37 0.13–0.37
Copper:
    Heat analysis 0.25–0.45 0.20–0.40 0.20–0.50 0.30–0.50 0.30–0.60 0.20–0.40
    Product analysis 0.22–0.48 0.17–0.43 0.17–0.53 0.27–0.53 0.27–0.63 0.17–0.43
Nickel:
    Heat analysis 0.25–0.45 0.50–0.80 0.25–0.50 0.50–0.80 0.30–0.60 0.20–0.40
    Product analysis 0.22–0.48 0.47–0.83 0.22–0.53 0.47–0.83 0.27–0.63 0.17–0.43
Chromium:
    Heat analysis 0.45–0.65 0.50–0.75 0.30–0.50 0.50–1.00 0.60–0.90 0.45–0.65
    Product analysis 0.42–0.68 0.47–0.83 0.27–0.53 0.45–1.05 0.55–0.95 0.42–0.68
Vanadium:
    Heat analysis B B 0.020 min B B B
    Product analysis B B 0.010 min B B B
Molybdenum:
    Heat analysis B 0.06 max B 0.10 max B B
    Product analysis B 0.07 max B 0.11 max B B
Titanium:
    Heat analysis B B B 0.05 max B  
    Product analysis B B B 0.06 max B B
A A, B, C, D, E, and F are classes of material used for Type 3 bolts. Selection of a class shall be at the option of the bolt manufacturer.
B These elements are not specified or required.

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