UNS S44626 (446) Stainless Steel Sheet and Plate – High Chromium Heat-Resistant Ferritic

 

UNS S44626 (446) high-chromium stainless steel sheet and plate designed for excellent high-temperature oxidation and sulfidation resistance. Suitable for furnaces, boilers, and exhaust systems. Technical data from Gangsteel.

Rewritten Opening Content:

UNS S44626, commonly referred to as 446 stainless steel, is a high-chromium ferritic stainless steel (23–27% Cr) developed for superior performance in high-temperature oxidizing and sulfidizing environments. It offers outstanding resistance to scaling and maintains good strength at temperatures up to 1100°C, making it ideal for long-term heat exposure.

Unlike austenitic grades, 446 remains non-magnetic and provides excellent thermal conductivity with lower thermal expansion.

Gangsteel stocks ASTM A240 / ASME SA240 compliant UNS S44626 sheets and plates with reliable availability. We offer quick turnaround and custom fabrication services for heat-treatment and industrial furnace projects.

Key Benefits:

• Exceptional high-temperature oxidation and scaling resistance
• Good resistance to sulfur-containing atmospheres
• Lower cost than nickel-bearing heat-resistant alloys
• Stable ferritic structure at elevated temperatures

Main Applications:

• Furnace linings and radiant tubes
• Boiler baffles and superheaters
• Petrochemical and refinery equipment
• Exhaust gas handling systems

Performance Highlight: UNS S44626 is frequently selected when operating conditions involve cyclic heating and exposure to combustion gases, often delivering longer service life than standard 409 or 430 grades.

Why Choose ASME SA240/ASTM A240 UNS S44626 Stainless Steel Sheet?

 

ASME SA240/ASTM A240 UNS S44626, a super-ferritic stainless steel, features 25.0-27.0% chromium, 0.75-1.50% molybdenum, and titanium stabilization (0.20-0.50%), offering exceptional corrosion resistance, good weldability, and moderate strength. Designed for applications requiring durability in highly corrosive and high-temperature environments, such as chemical processing equipment and heat exchangers, it benefits from titanium stabilization and low carbon content (≤ 0.02%) to prevent carbide precipitation during welding, outperforming non-stabilized grades like sa240/a240 uns s43000. Its ferritic structure ensures excellent scaling resistance up to 1050°C (1922°F).

Gangsteel notes that UNS S44626 provides superior corrosion resistance compared to sa240/a240 uns s41008 due to higher chromium and molybdenum content, and it is more cost-effective than super-ferritic grades like sa240/a240 uns s44700. While less ductile than lower-alloy grades, its corrosion resistance makes it ideal for harsh environments.

Key benefits include:

• Exceptional Corrosion Resistance: High chromium (25.0-27.0%) and molybdenum (0.75-1.50%) ensure superior performance in corrosive environments, surpassing sa240/a240 uns s42900.
• Good Weldability: Titanium stabilization enhances weldability compared to sa240/a240 uns s44400.
• High Heat Resistance: Suitable for temperatures up to 1050°C (1922°F), outperforming sa240/a240 uns s43035.
• Cost-Effectiveness: More affordable than sa240/a240 uns s44660.

Case Study: An Indian chemical plant used UNS S44626 sheets for heat exchanger components, achieving a 25% cost reduction compared to sa240/a240 uns s44700 while maintaining excellent corrosion resistance.

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ASME SA240/ASTM A240 UNS S44626 Density

 

Gangsteel confirms that the density of ASME SA240/ASTM A240 UNS S44626 is approximately 7.70 g/cm³ (0.278 lb/in³), typical for ferritic stainless steels with high chromium content. This density supports precise weight calculations for applications like heat exchangers, aligning with sa240/a240 uns s41003 (7.70 g/cm³) and slightly less than sa240/a240 uns s42035 (7.75 g/cm³).

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Corrosion Resistance of ASME SA240/ASTM A240 UNS S44626

 

Gangsteel highlights that ASME SA240/ASTM A240 UNS S44626 offers exceptional corrosion resistance in highly corrosive environments due to its 25.0-27.0% chromium and 0.75-1.50% molybdenum content, with a pitting resistance equivalent number (PREN) of ~26.5-30.5. Ideal for chemical processing and marine applications, it outperforms sa240/a240 uns s41008 and sa240/a240 uns s44400 in chloride-rich environments. Its high-temperature oxidation resistance is superior to sa240/a240 uns s43000.

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Weldability of ASME SA240/ASTM A240 UNS S44626

 

Gangsteel notes that the low carbon content (≤ 0.02%) and titanium stabilization (0.20-0.50%) in ASME SA240/ASTM A240 UNS S44626 ensure good weldability, minimizing carbide precipitation. It outperforms martensitic grades like sa240/a240 uns s41500 and is comparable to sa240/a240 uns s43035. Suitable for TIG, MIG, and shielded metal arc welding, it uses titanium-stabilized or low-carbon ferritic fillers.

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ASME SA240/ASTM A240 UNS S44626 Stainless Steel Surface Finishes

 

Gangsteel offers a range of surface finishes for ASME SA240/ASTM A240 UNS S44626 to enhance its versatility for industrial applications:

Surface Finish	Definition/Feature	Summary of Manufacturing Method	Application/Use
NO.1	Silver white, matte	Hot rolled, heat treated, and pickled	Industrial tanks, pipes
2B	Stronger gloss than NO.2D	Cold rolled, heat treated, pickled, lightly polished	Chemical processing equipment, heat exchangers
NO.2D/2BB	Silver white	Cold rolled, heat treated, pickled	Deep-drawn components
NO.3	Rough grinding	Polished with 100-120# abrasives (JIS R6001)	Industrial components
NO.4 (4K)	Intermediate grinding	Polished with 150-180# abrasives (JIS R6001)	Architectural panels
NO.240	Fine grinding	Ground with 240# abrasive belt	Precision components
NO.320	Very fine grinding	Ground with 320# abrasive belt	High-end industrial components
NO.400	Gloss close to BA	Polished with 400# wheel	Industrial fittings
HL	Hairline, continuous streaks	Polished with 150-240# abrasive	Structural components
BA (No.6/BA1/BA0)	Mirror-like, bright	Cold rolled with bright heat treatment	Decorative surfaces
NO.7	Near-mirror polishing	Polished with 600# rotary wheel	Specialized industrial applications
NO.8 (Mirror/8K)	Shining mirror finish	Polished with fine wheels	Reflectors, high-end components

These finishes make sa240/a240 uns s44626 suitable for applications like 2B for chemical equipment or NO.4 for panels.

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Chemical Composition of ASME SA240/ASTM A240 UNS S44626

 

Gangsteel ensures that the ASME SA240/ASTM A240 UNS S44626 chemical composition is optimized for corrosion resistance and weldability, compliant with sa240/a240 uns stainless grades.

Element	Percentage (%)
Chromium (Cr)	25.0 – 27.0
Molybdenum (Mo)	0.75 – 1.50
Titanium (Ti)	0.20 – 0.50
Carbon (C)	≤ 0.02
Manganese (Mn)	≤ 0.40
Silicon (Si)	≤ 0.40
Phosphorus (P)	≤ 0.020
Sulfur (S)	≤ 0.020
Nickel (Ni)	≤ 0.50
Nitrogen (N)	≤ 0.015
Iron (Fe)	Balance (~70%)

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Mechanical Properties of ASME SA240/ASTM A240 UNS S44626

 

Gangsteel notes that the ASME SA240/ASTM A240 UNS S44626 mechanical properties balance strength and corrosion resistance, ideal for high-temperature applications. Annealing at 870-950°C (1600-1742°F) optimizes performance.

Property	Value at 20°C
Tensile Strength (MPa)	≥ 450 (65 ksi)
Yield Strength (MPa)	≥ 310 (45 ksi)
Elongation (%)	≥ 20
Hardness (HBW)	≤ 190
Density	7.70 g/cm³ (0.278 lb/in³)

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Specifications and Forms of ASME SA240/ASTM A240 UNS S44626

 

Gangsteel supplies sa240/a240 uns s44626 in various forms, compliant with ASTM A240 and ASME SA240:

• Sheet and Plate: 0.1-6 mm (sheet), 0.5-50 mm (plate), width up to 2000 mm, length 2000-12000 mm. Finishes include 2B, No.1, No.4, BA.
• Coil: 0.1-6 mm thickness, up to 2000 mm width, for welded components.
• Bar: 6-300 mm diameter, up to 12000 mm length, hot-rolled or cold-drawn.
• Custom Components: Flanges, fittings, and stainless cutting sheet part with ±0.05 mm tolerances.

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Applications of ASME SA240/ASTM A240 UNS S44626

 

Gangsteel highlights that ASME SA240/ASTM A240 UNS S44626 excels in high-corrosion and high-temperature applications:

• Chemical Processing: Heat exchangers and reactor components.
• Industrial Equipment: Furnace parts and exhaust systems.
• Marine Applications: Components exposed to chloride environments.
• Structural Supports: Bars for high-temperature frameworks.
• Welded Components: Cost-effective for severe environments.

Case Study: An Indian chemical plant used UNS S44626 for reactor linings, saving 20% compared to sa240/a240 uns s44660.

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Comparison of ASME SA240/ASTM A240 UNS S44626 with Related Grades

 

Gangsteel presents a comparison of sa240/a240 uns s44626 with six ferritic grades:

Property	UNS S44626	UNS S41003	UNS S41008	UNS S42900	UNS S43000	UNS S43035	UNS S44400
UNS Number	S44626	S41003	S41008	S42900	S43000	S43035	S44400
Type	Ferritic	Ferritic	Ferritic	Ferritic	Ferritic	Ferritic	Ferritic
Chromium Content	25.0-27.0%	10.5-12.5%	11.5-13.5%	14.0-16.0%	16.0-18.0%	17.0-19.0%	17.5-19.5%
Nickel Content	≤ 0.50%	≤ 1.0%	≤ 0.60%	≤ 0.75%	≤ 0.75%	≤ 0.5%	≤ 1.0%
Manganese Content	≤ 0.40	≤ 1.5	≤ 1.0	≤ 1.0	≤ 1.0	≤ 1.0	≤ 1.0
Molybdenum Content	0.75-1.50%	-	-	-	-	-	1.75-2.50%
Nitrogen Content	≤ 0.015%	≤ 0.03%	-	-	-	≤ 0.03%	≤ 0.035%
Carbon Content	≤ 0.02%	≤ 0.03%	≤ 0.08%	≤ 0.12%	≤ 0.12%	≤ 0.03%	≤ 0.025%
Corrosion Resistance	Exceptional	Good	Good	Good	Good	Excellent	Excellent
Strength	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate
Temp Range	Up to 1050°C	Up to 650°C	Up to 650°C	Up to 675°C	Up to 815°C	Up to 815°C	Up to 815°C
Cost (USD/kg)	4-6	2.5-4	3-5	3-5	3-5	3-5	3.6-6
Applications	Chemical processing, heat exchangers	Structural supports	Automotive, industrial	Appliances	Appliances	Automotive exhausts	Chemical processing

• UNS S44626 vs UNS S41003: Exceptional corrosion resistance compared to sa240/a240 uns s41003.
• UNS S44626 vs UNS S41008: Superior performance than sa240/a240 uns s41008.
• UNS S44626 vs UNS S42900: Enhanced corrosion resistance compared to sa240/a240 uns s42900.
• UNS S44626 vs UNS S43000: Better corrosion and heat resistance than sa240/a240 uns s43000.
• UNS S44626 vs UNS S43035: Superior corrosion resistance compared to sa240/a240 uns s43035.
• UNS S44626 vs UNS S44400: Comparable corrosion resistance to sa240/a240 uns s44400 but higher heat resistance.

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Equivalent Materials for ASME SA240/ASTM A240 UNS S44626

 

Gangsteel ensures ASME SA240/ASTM A240 UNS S44626 aligns with global standards:

Standard	Grade
UNS	S44626
W.Nr.	1.4418
EN	X1CrMoTi25-1
GB	022Cr26MoTi
JIS	SUS XM27
ASTM	A240
ASME	SA240

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Allowable Stress for ASME SA240/ASTM A240 UNS S44626

 

Per ASME BPVC Section II, Part D, Gangsteel confirms:

Temperature (°C)	Allowable Stress (MPa)
100	125
200	115
300	105
400	95
500	85

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Price of ASME SA240/ASTM A240 UNS S44626

 

Gangsteel offers ASME SA240/ASTM A240 UNS S44626 at USD 4-6 per kg (FOB), slightly higher than sa240/a240 uns s44400 (USD 3.6-6) due to higher chromium and molybdenum content. Contact admin@gangsteel.com for quotes.

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Related Stainless Steel Grades

Gangsteel’s sa240/a240 uns stainless grades portfolio includes:

• sa240/a240 uns s40500: Ferritic stainless steel for automotive and heat exchanger applications.
• sa240/a240 uns s40900: Ferritic stainless steel for automotive exhausts.
• sa240/a240 uns s40910: Ferritic stainless steel for cost-effective applications.
• sa240/a240 uns s40920: Ferritic stainless steel for automotive exhausts.
• sa240/a240 uns s40930: Ferritic stainless steel for general-purpose applications.
• sa240/a240 uns s40945: Ferritic stainless steel for corrosion-resistant applications.
• sa240/a240 uns s40975: Ferritic stainless steel for automotive components.
• sa240/a240 uns s40977: Ferritic stainless steel for cost-effective applications.
• sa240/a240 uns s41000: Martensitic stainless steel for high-strength applications.
• sa240/a240 uns s41003: Ferritic stainless steel for structural supports.
• sa240/a240 uns s41008: Ferritic stainless steel for automotive and industrial applications.
• sa240/a240 uns s41045: Ferritic stainless steel for corrosion-resistant applications.
• sa240/a240 uns s41050: Ferritic stainless steel for general-purpose applications.
• sa240/a240 uns s41500: Martensitic stainless steel for high strength and corrosion resistance.
• sa240/a240 uns s42035: Martensitic stainless steel for high-strength applications.
• sa240/a240 uns s42900: Ferritic stainless steel for corrosion resistance.
• sa240/a240 uns s43000: Ferritic stainless steel for appliances and trim.
• sa240/a240 uns s43035: Ferritic stainless steel for corrosion-resistant applications.
• sa240/a240 uns s43400: Ferritic stainless steel for automotive trim.
• sa240/a240 uns s43600: Ferritic stainless steel for corrosion-resistant applications.
• sa240/a240 uns s43932: Ferritic stainless steel for automotive and industrial applications.
• sa240/a240 uns s43940: Ferritic stainless steel for automotive and industrial applications.
• sa240/a240 uns s44500: Ferritic stainless steel for corrosion resistance.
• sa240/a240 uns s44626: Ferritic stainless steel for high-temperature corrosion resistance.
• sa240/a240 uns s44627: Ferritic stainless steel for high-temperature applications.
• sa240/a240 uns s44635: Ferritic stainless steel for corrosion and heat resistance.
• sa240/a240 uns s44660: Ferritic stainless steel for severe corrosive environments.
• sa240/a240 uns s44700: Ferritic stainless steel for high corrosion resistance.
• sa240/a240 uns s44735: Ferritic stainless steel for extreme corrosion resistance.
• sa240/a240 uns s44800: Ferritic stainless steel for high corrosion resistance.
• sa240/a240 uns s46800: Ferritic stainless steel for corrosion-resistant applications.

Note: These grades complement sa240/a240 uns s44626 for various applications. Contact Gangsteel for a full catalog.

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FAQ

 

Q: How does UNS S44626 compare to UNS S44400?

A: UNS S44626 offers superior corrosion and heat resistance due to higher chromium (25.0-27.0%) compared to sa240/a240 uns s44400 (17.5-19.5%).

Q: Is UNS S44626 suitable for chemical processing?

A: Yes, its exceptional corrosion resistance makes it ideal compared to sa240/a240 uns s41003.

Q: What’s the price difference with UNS S44700?

A: UNS S44626 is 10-20% less expensive than sa240/a240 uns s44700 due to lower alloy content.

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Contact Us

 

Gangsteel invites you to contact them at admin@gangsteel.com for sa240/a240 uns s44626 quotes and custom solutions.

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