A105N 800Lb Forged 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

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A105N 800LB SW Forged Steel Gate Valve - API602, 1/2 inch to 2 inch

China Industrial A105N 800LB SW Forged Steel Gate Valve Supplier, Exporter, Manufacturer. The A105N 800LB SW Forged Steel Gate Valve uses A105N carbon steel body material, designed for reliable shut-off in high-pressure, high-temperature 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 reduced port available. A105N offers finer grain structure, improved toughness and better low-temperature performance than standard A105. Ideal for petroleum, oil and gas, low-pressure steam, chemical and power generation applications.

A105N 800LB Forged Gate Valve Specifications

• Type of Valve: Gate Valve

• Valve Body: Forged Type, Forged Steel A105N

• Bonnet Type: Bolted Bonnet (B.B.), Bolted Cover (B.C.)

• Stem Type: Rising Stem (OS&Y)

• Bore Type: Full Port / Reduced Port

• Drive Type: Manual Handwheel

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

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

• Pressure Rating: ANSI Class 800Lb (800#)

• Body Material: Forged Steel A105, A105N

• Trim Materials: 13Cr, Half Stellite, Full Stellite (Trim No.1, No.5, No.8)

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

• Test and Inspection: API 598

• Temperature Range: -29°C to 425°C (-20°F to 800°F)

• Custom Options: Other materials and pressure ratings are available upon request

✓ A105N carbon steel offers finer grain structure and improved toughness compared to standard A105, ideal for thermal cycling and low-temperature service

A105 vs A105N Material Comparison

Feature	A105	A105N
Heat Treatment	As forged	Normalized, air cooled
Grain Structure	Coarser	Finer and more uniform
Internal Stress	May retain residual stress	Relieved by normalizing
Toughness	Standard	Enhanced, better impact resistance
Low-Temp Performance	Limited below -1°C	Suitable for low-temperature service
Best Application	General pressure systems	High-stress, thermal cycling, critical service

Reference: ASTM A105/A105M. A105 and A105N share the same chemical composition. A105N is the industry standard for forged valve bodies.

ASTM A105/A105N Chemical Composition

Element	Composition (%)	Function
Carbon (C)	0.35 max	Adds hardness and strength
Manganese (Mn)	0.60 – 1.05	Enhances hardenability and tensile strength
Silicon (Si)	0.10 – 0.35	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 A105/A105M. Sum of Cu, Ni, Cr, Mo and V shall not exceed 1.00%. Sum of Cr and Mo shall not exceed 0.32%.

ASTM A105/A105N Mechanical Properties

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

Reference: ASTM A105/A105M. A105N achieves these properties with improved toughness and grain uniformity compared to as-forged A105.

Class 800 vs Adjacent Pressure Classes

Pressure Class	Design Pressure (bar)	Design Pressure (psi)	Typical Service
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)
Class 900	153	2,220	High-pressure steam, gas and oil transmission

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

A105N 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.

A105N 800LB Forged Gate Valve Applications

• Petroleum and Oil and Gas: Wellhead control panels, manifold and flowline isolation, chemical injection lines.

• Low-Pressure Steam: Steam tracing, condensate isolation, turbine room and steam plant service.

• Chemical Processing: Reagent feed lines, catalyst injection and corrosive fluid isolation.

• Power Generation: Boiler plant fuel lines, turbine room isolation, boiler drain and air vent.

• Instrumentation: Instrument root valves, sensing line isolation, steam trap isolation on small-bore high-pressure lines.

• Thermal Cycling Service: Systems with frequent temperature fluctuations where A105Ns finer grain structure and relieved internal stress provide superior reliability.

FAQ - A105N 800LB SW Forged Steel Gate Valve

Q1: What is the difference between A105 and A105N?

A: A105 and A105N have the same chemical composition. The only difference is the heat treatment: A105N is normalized and air-cooled, which refines the grain structure, relieves internal stresses, and improves toughness and low-temperature performance. A105N is the industry standard for forged valve bodies.

Q2: Why is A105N preferred over A105 for valve bodies?

A: A105N offers finer and more uniform grain structure, reduced internal stress, enhanced toughness and better impact resistance. It is particularly suitable for applications with thermal cycling, low-temperature service, and critical high-stress conditions. API 602 and NACE MR 0175 generally require normalized material for critical service.

Q3: What is the chemical composition of A105N?

A: A105N contains carbon (0.35% max), manganese (0.60-1.05%), silicon (0.10-0.35%), with limited phosphorus (0.035% max) and sulfur (0.040% max). Small amounts of copper, nickel, chromium, molybdenum and vanadium are permitted to enhance specific properties. The sum of these alloying elements shall not exceed 1.00%.

Q4: What is the temperature range for A105N forged gate valves?

A: The standard temperature range is -29°C to 425°C (-20°F to 800°F). A105Ns normalized structure improves low-temperature performance compared to standard A105, making it suitable for service below -1°C where A105 would typically require normalization anyway per API RP 14E.

Q5: What trim options are available for A105N 800LB gate valves?

A: Standard trim options include Trim 1# (13Cr disc, 13Cr seat), Trim 5# (Half Stellite or Full Stellite), and Trim 8# (13Cr disc, STL seat). Trim selection depends on operating temperature, pressure and fluid erosiveness. For severe erosive service, Full Stellite (Trim 5#) is recommended.

Q6: Is NACE MR 0175 available for A105N 800LB SW gate valves?

A: Yes, NACE MR 0175 compliance is available on request for sour oil and gas applications. A105Ns normalized condition satisfies NACE MR 0175 requirements for carbon steel in sour service. This includes material selection, hardness control and testing to ensure resistance to sulfide stress cracking.