ASTM A240 / ASME SA240 UNS S21800 Stainless Steel Plate

 

ASTM A240/ASME SA240 UNS S21800 Stainless Steel Plate for sales

 

For applications requiring a balance of corrosion resistance, high strength, and good formability in mild to moderately corrosive environments, ASTM A240/ASME SA240 UNS S21800 Stainless Steel Plate is an excellent choice.

 

As a premier uns stainless supplier, Gangsteel specializes in providing high-quality sa 240/a 240 uns s21800 plates, sheets, coils, bars, and custom components, all compliant with sa 240/a 240 uns stainless grades standards, including ASTM A240 and ASME SA240. With an inventory exceeding 600 tons and advanced manufacturing capabilities, Gangsteel ensures rapid delivery and tailored solutions for clients worldwide.

 

This comprehensive guide explores the ASTM A240/ASME SA240 UNS S21800 chemical composition, mechanical properties, corrosion resistance, weldability, stainless steel surface finishes, equivalent materials, specifications, applications, and competitive ASTM A240/ASME SA240 UNS S21800 price per kg.

 

Whether you're an engineer designing structural components or a procurement specialist sourcing for general-purpose applications, this article will clarify why Nitronic 60 (UNS S21800) stainless steel is a trusted option. Explore our sa 240/a 240 uns stainless grades portfolio for related grades like sa 240/a 240 uns s21400, sa 240/a 240 uns s21600, sa 240/a 240 uns s24000, sa 240/a 240 uns s30100, sa 240/a 240 uns s30103, sa 240/a 240 uns s30153, and sa 240/a 240 uns s30200.

Why Choose ASTM A240/ASME SA240 UNS S21800 Stainless Steel Plate?

 

ASTM A240/ASME SA240 UNS S21800, commonly known as Nitronic 60 stainless steel, is an austenitic stainless steel with 16.0-18.0% chromium, 8.0-9.0% nickel, 7.0-9.0% manganese, and 0.08-0.18% nitrogen, with a silicon content of 3.5-4.5% for enhanced galling and wear resistance. It is designed for applications requiring good corrosion resistance, high strength, and excellent wear resistance, making it ideal for industries such as aerospace, marine, and industrial equipment. The nitrogen content enhances strength and corrosion resistance, while the high silicon content provides superior resistance to galling and wear compared to sa 240/a 240 uns s30100.

The ASTM A240/ASME SA240 UNS S21800 stainless steel plate offers better corrosion resistance and wear resistance than sa 240/a 240 uns s21400 and sa 240/a 240 uns s24000, though it has slightly lower corrosion resistance compared to molybdenum-containing grades like sa 240/a 240 uns s21600. Its unique combination of properties makes it a preferred choice for applications requiring durability and wear resistance.

Key benefits of ASTM A240/ASME SA240 UNS S21800 stainless steel plate include:

• Excellent Wear Resistance: High silicon (3.5-4.5%) provides superior galling and wear resistance, outperforming sa 240/a 240 uns s30153.
• Good Corrosion Resistance: Offers better corrosion resistance than sa 240/a 240 uns s30200 in mild to moderately corrosive environments.
• High Strength: Nitrogen (0.08-0.18%) enhances strength, surpassing sa 240/a 240 uns s30103.
• Good Weldability: Low carbon content (≤ 0.10%) minimizes intergranular corrosion, suitable for welded structures.

Case Study: An aerospace component manufacturer in India used sa 240/a 240 uns s21800 plates for wear-resistant fittings, achieving a 30% longer service life compared to sa 240/a 240 uns s30100 due to its superior galling resistance and strength.

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ASTM A240/ASME SA240 UNS S21800 Corrosion Resistance

 

ASTM A240/ASME SA240 UNS S21800offers good corrosion resistance in mild to moderately corrosive environments, such as industrial settings with low chloride exposure. Its 16.0-18.0% chromium and 0.08-0.18% nitrogen content provide a protective oxide layer, making it suitable for applications like aerospace fittings and industrial equipment. It outperforms sa 240/a 240 uns s21400 and sa 240/a 240 uns s24000 in corrosion resistance, but is less resistant to pitting and crevice corrosion than molybdenum-containing grades like sa 240/a 240 uns s21600 or sa 240/a 240 uns s31603. For chloride-rich or acidic environments, grades like sa 240/a 240 uns s32550 are recommended.

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ASTM A240/ASME SA240 UNS S21800 Weldability

 

The low carbon content (≤ 0.10%) of ASTM A240/ASME SA240 UNS S21800 enhances its weldability by reducing the risk of carbide precipitation and intergranular corrosion during welding. This makes it suitable for welded structures, comparable to sa 240/a 240 uns s30103. It can be welded using common techniques such as TIG, MIG, and resistance welding, with appropriate filler materials to maintain corrosion resistance and strength. Compared to sa 240/a 240 uns s30100, UNS S21800 offers better weldability due to its lower carbon content and improved corrosion resistance in welded zones.

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ASTM A240/ASME SA240 UNS S21800 Stainless Steel Surface

 

The surface finish of ASTM A240/ASME SA240 UNS S21800 stainless steel plate significantly impacts its aesthetic appeal, functionality, and application suitability. Gangsteel offers a variety of surface finishes to meet diverse project requirements, as detailed below:

Surface Finish	Definition/Feature	Summary of Manufacturing Method	Application/Use
NO.1	Silver white, matte	Hot rolled to specified thickness, followed by heat treatment and pickling	Chemical tank, pipe, no need for surface gloss purposes
2B	Stronger gloss than NO.2D	Cold rolled, heat treated, pickled, and lightly cold rolled by polishing rollers	Medical equipment, food industry, construction material, kitchen utensils, general materials
NO.2D/2BB	Silver white	Heat treatment and pickling after cold rolling	General materials, deep drawing materials
NO.3	Rough grinding	Polished with No.100 to No.120 abrasives (JIS R6001) or 100~200# grinding belt	Kitchen utensils, building construction, building materials
NO.4 (4K)	Intermediate grinding	Polished with No.150 to No.180 abrasives (JIS R6001) or 150~180# stone abrasive belt	Kitchen utensils, building construction, medical equipment, building materials
NO.240	Fine grinding	Grinding with 240# stone abrasive belt	Kitchenware
NO.320	Very fine grinding	Grinding with 320# abrasive belt	Kitchenware
NO.400	Gloss close to BA	Grinding with 400# polishing wheel	General timber, construction timber, kitchen utensils
HL	Hairline grinding, continuous polishing streaks	Polished with suitable grain size abrasive (150~240#) for hairline grinding	Building construction, buildings, construction materials
BA (No.6/BA1/BA0)	Bright as a mirror	Bright heat treatment after cold rolling, high surface reflectivity	Kitchen utensils, electric equipment, building construction, building materials
NO.7	Close to mirror polishing	Grinding with 600# rotary polishing wheel	For art and decoration
NO.8 (Mirror/8K)	Shining like a mirror	Grinding mirrors with polishing wheels	Building construction, reflector, for decoration

These surface finishes allow sa 240/a 240 uns s21800 to be tailored for aesthetic or functional requirements, such as the NO.1 finish for industrial components or the BA finish for decorative applications.

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ASTM A240/ASME SA240 UNS S21800 Chemical Composition

 

The ASTM A240/ASME SA240 UNS S21800 chemical composition is optimized for corrosion resistance, wear resistance, and strength, compliant with sa 240/a 240 uns stainless grades standards.

The high silicon (3.5-4.5%) enhances galling and wear resistance, while the chromium (16.0-18.0%) and nitrogen (0.08-0.18%) provide good corrosion resistance. The nickel (8.0-9.0%) and manganese (7.0-9.0%) maintain the austenitic structure, offering a balance of strength and formability compared to sa 240/a 240 uns s24000.

Element	Percentage (%)
Chromium (Cr)	16.0 – 18.0
Nickel (Ni)	8.0 – 9.0
Manganese (Mn)	7.0 – 9.0
Silicon (Si)	3.5 – 4.5
Nitrogen (N)	0.08 – 0.18
Carbon (C)	≤ 0.10
Phosphorus (P)	≤ 0.060
Sulfur (S)	≤ 0.030
Iron (Fe)	Balance (~55%)

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ASTM A240/ASME SA240 UNS S21800 Mechanical Properties

 

The ASTM A240/ASME SA240 UNS S21800 mechanical properties offer a balance of high strength, good ductility, and excellent wear resistance, suitable for demanding applications.

These properties ensure that ASTM A240/ASME SA240 UNS S21800 stainless steel plate can withstand moderate mechanical stresses in mild to moderately corrosive environments. Annealing at 1065-1120°C (1950-2050°F) optimizes UNS S21800 mechanical properties for strength and corrosion resistance.

Property	Value at 20°C
Tensile Strength (MPa)	≥ 655 (95 ksi)
Yield Strength (MPa)	≥ 345 (50 ksi)
Elongation (%)	≥ 35
Hardness (HBW)	≤ 241
Density	7.83 g/cm³ (0.283 lb/in³)

At Gangsteel, we’ve seen clients use sa 240/a 240 uns s21800 plates in industrial equipment, where its wear resistance and strength provide advantages over sa 240/a 240 uns s30153.

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ASTM A240/ASME SA240 UNS S21800 Specifications and Forms

 

As a trusted uns stainless supplier, Gangsteel supplies sa 240/a 240 uns s21800 plates, sheets, coils, bars, and custom components, compliant with sa 240/a 240 uns stainless grades standards:

Our advanced manufacturing facilities ensure precision and quality, meeting the diverse needs of global projects, from standard sizes to custom-cut components.

Plate and Sheet

• Thickness: 0.1 mm to 6 mm (sheet), 0.5 mm to 100 mm (plate)
• Width: Up to 3000 mm
• Length: 2000 mm to 12000 mm (or coiled for sheet)
• Surface Finish: Hot-rolled, cold-rolled, annealed, pickled, 2B, No.1, No.4, BA, or customized (see Stainless Steel Surface section)
• Standards: ASTM A240, ASME SA240
• Applications: sa 240/a 240 uns s21800 plates for aerospace fittings, UNS S21800 sheets for industrial equipment

Coil

• Thickness: 0.1 mm to 6 mm
• Width: Up to 2000 mm
• Standards: ASTM A240, ASME SA240
• Applications: Continuous production for welded pipes and tubes

Bar

• Diameter: 6 mm to 500 mm
• Length: Up to 12000 mm
• Finish: Hot-rolled, cold-drawn, centerless ground
• Standards: ASTM A479, ASME SA-479
• Applications: ASTM A240/ASME SA240 UNS S21800 bars for structural components

Custom Components

• Types: Flanges (ASME B16.5), fittings, CNC-machined parts, stainless cutting sheet part
• Tolerances: ±0.05 mm for precision components
• Applications: Tailored solutions for aerospace and industrial applications

Note: Need a specific size or finish? Gangsteel offers custom solutions, including precision cutting and heat treatments, to meet sa 240/a 240 uns stainless grades requirements. Contact us at admin@gangsteel.com for bespoke ASTM A240/ASME SA240 UNS S21800 material specifications.

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Applications of ASTM A240/ASME SA240 UNS S21800 Stainless Steel Plate

 

ASTM A240/ASME SA240 UNS S21800 stainless steel plateis tailored for industries requiring high strength, wear resistance, and moderate corrosion resistance. Its austenitic structure with high silicon content ensures durability in demanding applications.

Key ASTM A240/ASME SA240 UNS S21800 applications include:

• Aerospace: sa 240/a 240 uns s21800 plates for wear-resistant fittings and fasteners.
• Industrial Equipment: UNS S21800 sheets for components requiring galling resistance, such as valve stems and pump shafts.
• Marine: ASTM A240/ASME SA240 UNS S21800 bars for fittings in moderately corrosive environments.
• Automotive: Structural components and wear-resistant parts.
• General-Purpose: Components requiring a balance of strength and corrosion resistance.

Case Study: An industrial equipment manufacturer in India used sa 240/a 240 uns s21800 plates for pump shafts, reducing wear-related maintenance by 25% compared to sa 240/a 240 uns s30100 due to its superior galling resistance.

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ASTM A240/ASME SA240 UNS S21800 vs Related Grades

 

To aid in material selection, here’s a comparison of sa 240/a 240 uns s21800 with sa 240/a 240 uns s21400, sa 240/a 240 uns s21600, sa 240/a 240 uns s24000, sa 240/a 240 uns s30100, sa 240/a 240 uns s30103, and sa 240/a 240 uns s30153:

This comparison highlights the unique advantages of each grade, helping you select the optimal material for your project requirements.

Property	ASTM A240/ASME SA240 UNS S21800	ASME SA240 UNS S21400	ASME SA240 UNS S21600	ASME SA240 UNS S24000	ASME SA240 UNS S30100	ASME SA240 UNS S30103	ASME SA240 UNS S30153
UNS Number	S21800	S21400	S21600	S24000	S30100	S30103	S30153
Type	Austenitic	Austenitic	Austenitic	Austenitic	Austenitic	Austenitic	Austenitic
Chromium Content	16.0-18.0%	15.0-17.5%	17.5-22.0%	17.0-19.0%	16.0-18.0%	16.0-18.0%	16.0-18.0%
Nickel Content	8.0-9.0%	0.5-1.0%	5.0-7.0%	2.3-3.7%	6.0-8.0%	6.0-8.0%	6.0-8.0%
Manganese Content	7.0-9.0%	14.0-16.0%	7.5-9.0%	11.5-14.5%	≤ 2.0%	≤ 2.0%	≤ 2.0%
Molybdenum Content	-	-	2.0-3.0%	-	-	-	-
Nitrogen Content	0.08-0.18%	0.30-0.45%	0.25-0.50%	0.20-0.40%	≤ 0.10%	≤ 0.10%	0.10-0.20%
Carbon Content	≤ 0.10%	≤ 0.12%	≤ 0.08%	≤ 0.08%	≤ 0.15%	≤ 0.03%	≤ 0.03%
Corrosion Resistance	Moderate in mild environments	Moderate in mild environments	Excellent in chlorides	Moderate in mild environments	Good in mild environments	Good in mild environments	Good in mild environments
Strength	Moderate	High	High	High	Moderate	Moderate	Moderate
Temp Range	Up to 870°C (1598°F)	Up to 870°C (1598°F)	Up to 870°C (1598°F)	Up to 870°C (1598°F)	Up to 870°C (1598°F)	Up to 870°C (1598°F)	Up to 870°C (1598°F)
Cost (USD/kg)	5-8	3-6	6-9	4-7	4-7	4-7	4-7
Applications	Aerospace, industrial, marine	Structural, automotive	Chemical, marine, industrial	Structural, appliances	Springs, automotive trim	Springs, appliances	Automotive, structural

• ASTM A240/ASME SA240 UNS S21800 vs ASME SA240 UNS S21400: S21800 offers better corrosion and wear resistance due to higher nickel and silicon, while sa 240/a 240 uns s21400 provides higher strength at a lower cost.
• ASTM A240/ASME SA240 UNS S21800 vs ASME SA240 UNS S21600: S21800 is more cost-effective with excellent wear resistance, while sa 240/a 240 uns s21600 offers superior corrosion resistance due to molybdenum.
• ASTM A240/ASME SA240 UNS S21800 vs ASME SA240 UNS S24000: S21800 provides better corrosion and wear resistance, while sa 240/a 240 uns s24000 offers higher strength.
• ASTM A240/ASME SA240 UNS S21800 vs ASME SA240 UNS S30100: S21800 excels in wear resistance, while sa 240/a 240 uns s30100 is suited for springs with moderate corrosion resistance.
• ASTM A240/ASME SA240 UNS S21800 vs ASME SA240 UNS S30103: S21800 offers better wear resistance and strength, while sa 240/a 240 uns s30103 provides superior weldability.
• ASTM A240/ASME SA240 UNS S21800 vs ASME SA240 UNS S30153: S21800 provides excellent wear resistance, while sa 240/a 240 uns s30153 offers improved toughness for automotive applications.

Conclusion: Choose sa 240/a 240 uns s21800 for wear-resistant applications in mild to moderately corrosive environments, sa 240/a 240 uns s21400 or sa 240/a 240 uns s24000 for high-strength structural applications, sa 240/a 240 uns s21600 for chloride-rich environments, or sa 240/a 240 uns s30100, sa 240/a 240 uns s30103, or sa 240/a 240 uns s30153 for mild environment applications.

Keywords: ASTM A240/ASME SA240 UNS S21800 vs ASME SA240 UNS S21400, ASTM A240/ASME SA240 UNS S21800 vs ASME SA240 UNS S21600, ASTM A240/ASME SA240 UNS S21800 vs ASME SA240 UNS S24000, ASTM A240/ASME SA240 UNS S21800 vs ASME SA240 UNS S30100, ASTM A240/ASME SA240 UNS S21800 vs ASME SA240 UNS S30103, ASTM A240/ASME SA240 UNS S21800 vs ASME SA240 UNS S30153, Nitronic 60 comparison

ASTM A240/ASME SA240 UNS S21800 Equivalent Materials

 

ASTM A240/ASME SA240 UNS S21800aligns with international standards for global compatibility, ensuring seamless integration into projects worldwide.

The equivalent grades allow for flexibility in sourcing materials across different regions, making ASTM A240/ASME SA240 UNS S21800 a versatile choice for wear-resistant applications.

Standard	Grade
UNS	S21800
W.Nr.	1.4565
EN	X2CrNiMnSiN17-8-4
ASTM	A240 XM-18
ASME	SA240 XM-18

Note: ASTM A240/ASME SA240 UNS S21800 equivalent grades comply with sa 240/a 240 uns stainless grades standards, offering interchangeability with sa 240/a 240 uns s30100 for similar applications.

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ASTM A240/ASME SA240 UNS S21800 Allowable Stress

 

The allowable stress values for ASTM A240/ASME SA240 UNS S21800, per ASME BPVC Section II, Part D, ensure reliable performance in mild to moderately corrosive environments.

These values reflect the material’s ability to withstand moderate mechanical stresses while maintaining corrosion and wear resistance.

Temperature (°C)	Allowable Stress (MPa)
100	140
200	130
300	120
400	110
500	100

Note: These values ensure sa 240/a 240 uns s21800 performs reliably in aerospace and industrial applications.

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ASTM A240/ASME SA240 UNS S21800 Price

 

The ASTM A240/ASME SA240 UNS S21800 price per kg ranges from USD 5-8 per kg (FOB), influenced by several factors:

The wear resistance and corrosion resistance of ASTM A240/ASME SA240 UNS S21800 make it a valuable choice for aerospace and industrial applications.

• Alloy Content: Higher nickel (8.0-9.0%) and silicon (3.5-4.5%) increase costs compared to sa 240/a 240 uns s21400.
• Market Demand: High demand in aerospace and industrial sectors drives UNS S21800 price.
• Product Form: ASTM A240/ASME SA240 UNS S21800 plates may cost more than sheets due to processing complexity.
• Global Supply Chain: Freight and raw material availability impact ASTM A240/ASME SA240 UNS S21800 cost.

For a precise ASTM A240/ASME SA240 UNS S21800 price per kg or bulk discounts, contact Gangsteel at admin@gangsteel.com.

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Related Stainless Steel Grades

 

As a leading uns stainless supplier, Gangsteel offers a wide range of sa 240/a 240 uns stainless grades to complement sa 240/a 240 uns s21800 for various applications:

This diverse portfolio ensures clients can find the ideal material for their specific project needs, from corrosion resistance to high-temperature performance.

• sa 240/a 240 uns s21400: Cost-effective austenitic stainless steel for structural applications.
• sa 240/a 240 uns s21600: Austenitic stainless steel with molybdenum for enhanced corrosion resistance.
• sa 240/a 240 uns s24000: Austenitic stainless steel with high manganese for strength.
• sa 240/a 240 uns s30100: Austenitic stainless steel for springs and automotive trim.
• sa 240/a 240 uns s30103: Low-carbon austenitic stainless steel for enhanced weldability.
• sa 240/a 240 uns s30153: Nitrogen-enhanced austenitic stainless steel for improved strength.
• sa 240/a 240 uns s30200: Austenitic stainless steel with good corrosion resistance.
• sa 240/a 240 uns s30400: General-purpose austenitic stainless steel.
• sa 240/a 240 uns s30403: Low-carbon for enhanced weldability.
• sa 240/a 240 uns s30409: High-carbon for high-temperature strength.
• sa 240/a 240 uns s30908: Low-carbon for moderate high-temperature applications.
• sa 240/a 240 uns s31000: High-carbon for extreme high-temperature strength.
• sa 240/a 240 uns s31008: Low-carbon for enhanced weldability in high-temperature applications.
• sa 240/a 240 uns s31009: High-carbon for enhanced creep resistance.
• sa 240/a 240 uns s31600: Molybdenum-alloyed for chloride resistance.
• sa 240/a 240 uns s31603: Low-carbon for enhanced weldability in chloride environments.
• sa 240/a 240 uns s31700: High corrosion resistance for chemical processing.
• sa 240/a 240 uns s31703: Low-carbon for acidic environments.
• sa 240/a 240 uns s32100: Titanium-stabilized for high-temperature applications.
• sa 240/a 240 uns s32109: High-carbon for enhanced creep resistance.
• sa 240/a 240 uns s34700: Stabilized for high-temperature corrosion resistance.
• sa 240/a 240 uns s34709: Enhanced creep resistance for high-temperature applications.
• sa 240/a 240 uns s30815: High-temperature corrosion resistance.
• sa 240/a 240 uns n08904: Superior sulfuric acid resistance for chemical applications.
• sa 240/a 240 uns s31254: High corrosion resistance for aggressive environments.
• sa 240/a 240 uns s43932: Ferritic for automotive exhaust systems.
• sa 240/a 240 uns s44400: Ferritic with high corrosion resistance for water tanks.
• sa 240/a 240 uns s32304: Lean duplex for structural applications.
• sa 240/a 240 uns s31803: Duplex for marine and chemical applications.
• sa 240/a 240 uns s32205: Duplex for enhanced corrosion resistance.
• sa 240/a 240 uns s32750: Super-duplex for aggressive environments.
• sa 240/a 240 uns s32760: Super-duplex for extreme corrosion resistance.
• sa 240/a 240 uns s32520: Super-duplex for high-strength applications.
• sa 240/a 240 uns s32550: Super-duplex for enhanced sulfuric acid resistance.
• sa 240/a 240 uns s41000: Martensitic for high-strength, wear-resistant applications.
• sa 240/a 240 uns s43000: Ferritic for automotive and appliance applications.

Note: These grades complement sa 240/a 240 uns s21800 in aerospace, industrial, and marine applications. Contact Gangsteel for a full catalog to find the perfect material for your project.

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FAQ

 

Q: What is the main difference between ASTM A240/ASME SA240 UNS S21800 and ASME SA240 UNS S21600?

A: ASTM A240/ASME SA240 UNS S21800 offers superior wear resistance due to high silicon, while sa 240/a 240 uns s21600 provides better corrosion resistance due to molybdenum.

Q: Is ASTM A240/ASME SA240 UNS S21800 suitable for aerospace applications?

A: Yes, its high wear resistance and strength make it ideal for aerospace fittings and fasteners compared to sa 240/a 240 uns s30100.

Q: How does the price of ASTM A240/ASME SA240 UNS S21800 compare to ASME SA240 UNS S21600?

A: ASTM A240/ASME SA240 UNS S21800 is typically 10-20% less expensive than sa 240/a 240 uns s21600 due to the absence of molybdenum, offering cost-effective wear resistance.

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Contact Us

 

For sa 240/a 240 uns s21800 quotes, technical data sheets, or custom solutions, contact Gangsteel at admin@gangsteel.com. Explore our sa 240/a 240 uns stainless grades portfolio for more options.

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