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ASTM A350
Description
ASTMA A 350/A 350M: American Society for Testing and Materials
Carbon and Low-Alloy Steel Forgings, Requiring Notch Toughness Testing for Piping Components
Scope: This Specification covers several grades of carbon and low-alloy steel forged or ring-rolled angles, forged fittings and valves intended primarily for low-temperature service and requiring notch toughness testing.

Chemical Composition
Element Composition, wt. %
Grade LF1 Grade LF2 Grade LF3 Grade LF5 Grade LF6 Grade LF9 Grade LF787
Carbon, max 0.3 0.3 0.2 0.3 0.22 0.2 0.07
Manganese 0.60±1.35 0.60±1.35 0.90 max 0.60±1.35 1.15±1.50 0.40±1.06 0.40±0.70
Phosphorus,max 0.035 0.035 0.035 0.035 0.025 0.035 0.025
Sulfur, max 0.04 0.04 0.04 0.04 0.025 0.04 0.025
Silicon 0.15±0.30 0.15±0.30 0.20±0.35 0.20±0.35 0.15±0.30 ... 0.40 max
Nickel 0.40 max 0.40 max 3.3±3.7 1.0±2.0 0.40 max 1.60±2.24 0.70±1.00
Chromium 0.30 max 0.30 max 0.30 max 0.30 max 0.30 maxB,C 0.30 max 0.60±0.90
Molybdenum 0.12 max 0.12 max 0.12 max 0.12 max 0.12 maxB,C 0.12 max 0.15±0.25
Copper 0.40 max 0.40 max 0.40 max 0.40 max 0.40 max 0.75±1.25 1.00±1.30
Columbium 0.02 max 0.02 max 0.02 max 0.02 max 0.02 max 0.02 max 0.02 min
Vanadium 0.08 max 0.08 max 0.03 max 0.03 max 0.04±0.11 0.03 max 0.03 max
Nitrogen . . . . . . . . . . . . 0.01±0.030 . . . . . .

Mechanical Properties
Grades
LF1 and LF5 LF2 LF3 LF6 LF9 LF787
Class 1 Classes 1 and 2 Classes 1 and 2 Class 2 Class 3
LF5 Class 1 Classes 2 and 3
Tensile strength, ksi [MPa] 60±85 70±95 70±95 66±91 75±100 63±88 65±85 75±95
[415±585] [485±655] [485±655] [455±630] [515±690] [435±605] [450±585] [515±655]
Yield strength, min, ksi [MPa] 30 [205] 36 [250] 37.5 [260] 52 [360] 60 [415] 46 [315] 55 [380] 65 [450]
Elongation:
Standard round specimen, or small proportional specimen, min % in 4D gage length 25 22 22 22 20 25 20 20
Strip specimen for wall thickness 5¤16 in. [7.94 mm] and over and for all small sizes tested in full section; min % in 2 in. [50 mm] 28 30 30 30 28 28 28 28
Equation for calculating min elongation for strip specimens thinner than 5¤16  in. [7.94 mm]; min % in 2 in. [50 mm] t = actual thickness in inches 48t + 13 48t + 15 48t + 15 48t + 15 48t + 13 48t + 13 48t + 13 48t + 13
Reduction of area, min, % 38 30 35 40 40 38 45 45

1.1 This Specification covers several grades of carbon and low-alloy steel forged or ring-rolled angles, forged fittings and valves intended primarily for low-temperature service and requiring notch toughness testing. They are made to specified dimensions, or to dimensional standards, such as the ASME and API Specifications referenced in Section 2. Although this Specification covers some piping components machined from rolled bar and seamless tubular materials (see 5.3.3), it does not cover raw material produced in these product forms.
1.2 No limitation on size is intended beyond the ability of the manufacturer to obtain the specified requirements. How-ever, Class 3 of Grade LF787 is only available in the quenched-and-precipitation heat treated condition.
1.3 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified by the purchaser in the order.

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