ASTM A350 Flanges

The ASTM A350 specification covers various types of flanges, including slip-on, welding neck, blind, socket welding, and threaded flanges. The standard sizes for these flanges range from 1/2 inch to 24 inches.

ASTM A350 Flanges

what is ASTM A350 Flanges?

ASTM A350 is a specification for carbon and low-alloy steel forgings, which are used to produce flanges, fittings, valves, and other components for high-temperature and high-pressure applications in industries such as oil and gas, chemical processing, and power generation.

ASTM A350 covers several grades of carbon and low-alloy steel, each with different mechanical properties and chemical compositions. The most common grades used for flanges include A350 LF2, A350 LF3, and A350 LF6, which are all suitable for use in low-temperature applications.

A350 LF2, A350 LF3, and A350 LF6 Flanges Chemical Composition

ASTM A350 Grade LF1	Element	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Copper
ASTM A350 Grade LF1	Weight %	0.30 max	0.60-1.00	0.035 max	0.040 max	0.15-0.30	0.40 max
ASTM A350 Grade LF2	Element	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Copper
ASTM A350 Grade LF2	Weight %	0.30 max	0.60-1.35	0.035 max	0.040 max	0.15-0.30	0.40 max
ASTM A350 Grade LF3	Element	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Nickel	Copper
ASTM A350 Grade LF3	Weight %	0.20 max	0.50-1.35	0.035 max	0.040 max	0.15-0.30	3.30-4.30	0.40 max
ASTM A350 Grade LF5	Element	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Nickel	Chromium	Molybdenum
ASTM A350 Grade LF5	Weight %	0.28 max	0.60-1.00	0.035 max	0.040 max	0.15-0.30	0.50 max	0.50-0.80	0.45-0.65
ASTM A350 Grade LF6	Element	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Nickel	Chromium	Molybdenum
ASTM A350 Grade LF6	Weight %	0.30 max	0.50-1.35	0.035 max	0.040 max	0.15-0.30	0.50 max	0.30 max	0.12 max
ASTM A350 Grade LF9	Element	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Nickel	Chromium
ASTM A350 Grade LF9	Weight %	0.20 max	0.70-1.00	0.035 max	0.040 max	0.15-0.30	8.00-9.00	0.90-1.20
ASTM A350 Grade LF787	Element	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Nickel	Chromium	Molybdenum
ASTM A350 Grade LF787	Weight %	0.28 max	0.60-1.35	0.035 max	0.040 max	0.15-0.30	2.20-2.80	0.80-1.20	0.15-0.25

Carbon steel astm a350 flange specification

ASTM A350 specification covers several grades of carbon and low-alloy steel forgings, including flanges. The carbon steel flanges covered by ASTM A350 are used in high-pressure and high-temperature service in industries such as oil and gas, chemical and petrochemical, and power generation.

The following are the grades of carbon steel flanges covered by ASTM A350:

Grade LF1: Low temperature carbon steel
Grade LF2: Low temperature carbon steel
Grade LF3: Low temperature carbon steel

The chemical composition of the steel used for ASTM A350 carbon steel flanges must meet the requirements specified in the standard. The carbon content must not exceed 0.35%, and the manganese content must not exceed 1.00%. Additionally, the phosphorus and sulfur content must be limited to a maximum of 0.035%.

The mechanical properties required for carbon steel flanges include tensile strength, yield strength, elongation, reduction of area, and hardness. The values for these properties vary depending on the grade of carbon steel and the type of flange.

In addition, ASTM A350 carbon steel flanges must also meet the requirements for notch toughness testing. This testing is performed to ensure that the flanges can withstand impact at low temperatures without fracturing.

Overall, the ASTM A350 specification provides comprehensive guidelines for the manufacture and testing of carbon steel flanges used in high-pressure and high-temperature applications.

SSM manufactures and supplies ASTM A350 carbon steel flanges in various sizes and materials. We have a strong technical support team and industrial workers to ensure product quality and delivery. Please feel free to call us for inquiries about carbon steel flanges.

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