Tafa Alcro/ Ocr25al5 Thermal Spray Wire for Boiler Tubes& Tube Shilds

• Product Type: Wire
• Material: Fecral
• Carbon Content: Low Carbon
• Size: 1.6mm (1/16 Inch)
• Application: Boiler Tube/Dimension Restoration
• Spool Type: D 300
• Model NO.: OCr25Al5
• Wire Weight: 15kg Each Spool
• Wire Type: Solid Wire
• Coating Hardness: 85~90 Hrb
• Equal to: Pmet 731
• Transport Package: 15kg Each Spool
• Specification: 1.6mm
• Trademark: Allotech
• Origin: China
• HS Code: 722330000
• Production Capacity: 10 Tons Every Month

Product Description

Alcro Wire is a ferritic iron-chromium-aluminum alloy (FeCrAl alloy) for use in arc and flame spray systems. The alloy produces dense, well bonding coatings, resistant to high-temperature oxidation and corrosion.

Typical applications for Alcro wire are bond coats in high-temperature coating systems, protective coatings in high-temperature atmospheres containing sulphur or carbon and protective coatings against scaling of conventional low alloy steels.

Chemical composition

	C %	Si %	Mn %	Cr %	Al %	Fe %
Nominal composition						Bal.
Min	-	-	-	20.5	5.3
Max	0.08	0.7	0.4	23.5	6.3

Machining

Depending of surface finish requirements, the coating may be machined by turning or grinding. For rougher surface, turning using carbide tools, light cuts and efficient cooling to avoid overheating is recommended. Grinding in fine steps using cooling, light pressure and clean wheels gives smoother finish.

Mechanical properties

Wire size	Yield strength	Tensile strength	Elongation
Ø	Rp0.2	Rm	A
mm	MPa	MPa	%
1.6	830	930	5

Physical properties

Density g/cm3	7.10
Electrical resistivity at 20°C Ω mm2/m	1.45
Melting point	1500 °C
Magnetic Properties	The material is magnetic up to approximately 600 °C (the Curie point).
Dimension tolerance mm	+ 0/-0.05

 

Young's Modulus

Temperature °C	20
GPa	220

Typical coating properties

Summary of results obtained when spraying with a conventional Arc Spray gun, using varying spraying parameters.

Deposition efficiency (%)	62-78
Hardness HV (300g)	165-280
Surface roughness (µm)	11-16
Porosity (%)	1-6*
Oxides (%)	5-20*

*) These results are obtained when using air as spraying gas. Also nitrogen has been used, resulting in lower rates of porosity and oxides.

Safety

Personnel working with thermal spraying should be aware of the hazards connected to the process. They should be familiar with the use of equipment regarding, i.e. eye, skin, hearing and respiratory protection.