800Lb A350 LF2 SW Gate Valve

CAST VALVE SERIES

 GATE VALVE

 GLOBE VALVE

 CHECK VALVE

 BALL VALVE

 BUTTERFLY VALVE

FORGED VALVE SERIES

 FORGED GATE VALVE

 FORGED GLOBE VALVE

 FORGED CHECK VALVE

INDUSTRIAL STRAINER SERIES

 Y TYPE STRAINER

 BASKET STRAINER

 T TYPE STRAINER

 TEMPORARY STRAINER

 FORGED STRAINER

 STRAINER SCREEN & BASKET

LATEST PRODUCTS

A350-LF2 Low Temperature Steel Gate Valve 800LB SW - API602, 1/2 inch to 2 inch

China Industrial A350-LF2 Low Temperature Steel Gate Valve 800LB SW Supplier, Exporter, Manufacturer. The A350-LF2 low temperature steel gate valve is designed for reliable shut-off in low-temperature and cryogenic pipeline systems. Manufactured per API 602, rising stem OS&Y, bolted bonnet construction, Socket Weld (SW) ends. Sizes 1/2 inch to 2 inch (DN15 to DN50), pressure rating ANSI Class 800Lb. Full port or regular port available. A350-LF2 provides excellent low-temperature impact toughness down to -46°C, making it ideal for LNG, refrigeration, petrochemical and low-temperature service. NACE MR 0175 available on request.

Low Temperature Carbon Steel LF2 Gate Valve Specifications

• Design and Manufacture: API 602, BS 5352, ASME B16.34

• Pressure Ratings: ANSI Class 150Lb – 800Lb (800# standard for this page)

• Bonnet Type: OS&Y, Bolted Bonnet (B.B.)

• Stem Type: Rising Stem (RS)

• Port Type: Full Port / Regular Port

• Size Range: 1/2 inch to 2 inch (DN15 to DN50)

• End Connection: Socket Weld (SW) per ANSI B16.11

• Body Material: Forged Steel, Low Temperature Steel A350-LF2

• Trim Materials: 13Cr, STL, Stainless Steel 304 / 316

• Sour Service: NACE MR 0175 on Request

• Test and Inspection: API 598

• Temperature Range: -46°C to 425°C (-50°F to 800°F)

✓ A350-LF2 low temperature steel offers excellent impact toughness at low temperatures, ideal for LNG, refrigeration and cryogenic service

A350-LF2 vs A105N Material Comparison

Feature	A350-LF2	A105N
Standard	ASTM A350/A350M	ASTM A105/A105M
Heat Treatment	Normalized	Normalized
Low-Temp Toughness	Excellent, impact tested at -46°C	Limited, not suitable below -1°C
Temperature Range	-46°C to 425°C	-29°C to 425°C
Impact Test	Required per ASTM A350	Not required by default
Best Application	LNG, refrigeration, cryogenic, low-temp service	General pressure systems, ambient temperature

Reference: ASTM A350/A350M and ASTM A105/A105M. A350-LF2 is specifically designed and impact tested for low-temperature service down to -46°C.

ASTM A350-LF2 Chemical Composition

Element	Composition (%)	Function
Carbon (C)	0.30 max	Adds hardness and strength
Manganese (Mn)	0.60 – 1.35	Enhances hardenability and tensile strength
Silicon (Si)	0.15 – 0.30	Improves strength and deoxidation
Phosphorus (P)	0.035 max	Impurity control, maintains ductility
Sulfur (S)	0.040 max	Impurity control, maintains toughness
Copper (Cu)	0.40 max	Corrosion resistance
Nickel (Ni)	0.40 max	Toughness and corrosion resistance
Chromium (Cr)	0.30 max	Hardness and wear resistance
Molybdenum (Mo)	0.12 max	High-temperature strength
Vanadium (V)	0.08 max	Grain refinement

Reference: ASTM A350/A350M. Sum of Cu, Ni, Cr, Mo and V shall not exceed 1.00%. Sum of Cr and Mo shall not exceed 0.32%.

ASTM A350-LF2 Mechanical Properties and Low-Temperature Impact Test

Property	Value
Tensile Strength (min)	485 MPa (70,000 psi)
Yield Strength (min)	250 MPa (36,000 psi)
Elongation (min)	22%
Reduction of Area (min)	30%
Hardness (max)	187 HB
Impact Test Temperature	-46°C (-50°F)
Charpy V-Notch Impact (min)	20 J (15 ft-lb) average

Reference: ASTM A350/A350M. A350-LF2 is impact tested at -46°C to ensure low-temperature toughness for cryogenic and low-temperature service.

Class 800 vs Adjacent Pressure Classes

Pressure Class	Design Pressure (bar)	Design Pressure (psi)	Typical Service
Class 150	19.6	285	Low-pressure water, oil, gas and utility lines
Class 300	51	740	General hydrocarbon, steam and process piping
Class 600	102	1,480	High-pressure process, refinery and power plant
Class 800	138	2,000	General hydrocarbon, steam, water, instrument lines (this page)

Reference: API 602 and ASME B16.34. Class 800 is a forged valve-specific rating, approximately between Class 600 and Class 900.

A350-LF2 800LB SW Forged Gate Valve Dimensions

NPS (inch)	DN (mm)	L (mm)
1/2″	15	79
3/4″	20	92
1″	25	111
1-1/4″	32	120
1-1/2″	40	120
2″	50	140

Reference: API 602 / ASME B16.10. Dimensions may vary by manufacturer. Contact us for confirmed drawing.

Low Temperature Gate Valve Applications

• LNG and Cryogenic: LNG liquefaction, storage and regasification, cryogenic piping and low-temperature process lines.

• Refrigeration: Industrial refrigeration systems, cold storage and refrigerated transport.

• Petrochemical: Low-temperature hydrocarbon processing, ethylene and propylene service.

• Oil and Gas: Cold climate wellhead control panels, low-temperature manifold and flowline isolation.

• Power Generation: Low-temperature boiler plant fuel lines and auxiliary systems.

• Low-Temperature Storage: Liquid nitrogen, liquid oxygen and other cryogenic media isolation.

FAQ - A350-LF2 Low Temperature Steel Gate Valve 800LB SW

Q1: What is the difference between A350-LF2 and A105N?

A: Both are normalized carbon steels with similar chemical composition. The key difference is the low-temperature impact toughness: A350-LF2 is impact tested at -46°C and is specifically designed for low-temperature and cryogenic service, while A105N is not impact tested by default and is limited to -29°C. A350-LF2 is the standard choice for LNG, refrigeration and cold climate applications.

Q2: What is the minimum service temperature for A350-LF2?

A: A350-LF2 is impact tested at -46°C (-50°F) with a minimum Charpy V-Notch impact energy of 20 J (15 ft-lb) average. This makes it suitable for service down to -46°C. For lower temperatures, A350-LF3 or stainless steel materials should be considered.

Q3: Why is impact testing required for A350-LF2?

A: Impact testing ensures the material has sufficient toughness to resist brittle fracture at low temperatures. ASTM A350 requires Charpy V-Notch impact testing at -46°C for LF2 grade, which is critical for cryogenic and low-temperature pipeline safety.

Q4: What end connections are available for A350-LF2 gate valves?

A: We offer Socket Weld (SW) per ANSI B16.11 for permanent, leak-tight high-pressure connections. Threaded (NPT) and Butt Weld (BW) ends are also available on request. SW is generally preferred for low-temperature service to avoid leak paths.

Q5: What trim options are available for A350-LF2 800LB gate valves?

A: Standard trim options include 13Cr, STL (Stellite), and stainless steel 304 or 316. For low-temperature service, stainless steel trim is often preferred for its toughness. Trim selection depends on operating temperature, pressure and fluid corrosiveness.

Q6: Is NACE MR 0175 available for A350-LF2 800LB SW gate valves?

A: Yes, NACE MR 0175 compliance is available on request for sour oil and gas applications. A350-LF2s normalized condition and low-temperature toughness satisfy NACE MR 0175 requirements for carbon steel in sour service. Please specify NACE MR 0175 in your inquiry.