Niobio Piastra di afnio

PRODUCTION INFORMATION

Name:	high purity polished cheap niobium Hafnium plate
Size:	Diameter ：width <6 inch (152.4mm)、Thickness >0.187Inch（4.75mm）
Standard:	ASTM R04296 ,  C103
Production Process:	Extrusion, forging,  rolling  etc.

Chemical   Composition:

R04295 Niob-Hafnium alloy plate
element	Content ,Max,Weight % (Unless otherwise specified)
C	0.015
O	0.025
N	0.01
H	0.0015
Hf	9~11
Ti	0.7~1.3
Zr	0.7
W	0.5
Ta	0.5
Nb(Take the difference)

Mechanical performance requirement:
R04295 Nb-Hafnium alloy (Specified by the demander)
element		Content ,Max,Weight %
O		0.035
C		0.015
N		0.01
H		0.0015

annealed condition (At least 90% recrystallization):
	ultimate tensile strength,Min Ib/inch2(MPa)	Yield strength, (0.2% residual deformation) lb/in 2 (Mpa)	Elongation at 1 inch (25 mm) gauge length,% minimum
Material:Diameter≤0.050 inches (1.27mm)	56000(386)	42000(276)	20
indoor temperature	21000(145)	16000(110)	20
2000±25℉(1093±14℃)
Material:Diameter ≥0.051(1.20mm)	54000(372)	38000(262)	20
Indoor temperature	21000(145)	16000(110)	20
2000±25℉(1093±14℃)

Rolling, forging or drawing round cross-section bar and wire rod size allowable deviation:
Diameter, inch (mm)		allowable deviation, + or - ，inch （mm）
≥0.020～0.030(0.51～0.76)		0.00075(0.019)
≥0.030～0.060(0.76～1.52)		0.001(0.025)
≥0.060～0.090(1.52～2.29)		0.0015(0.038)
≥0.090～0.125(2.29～3.19)		0.002(0.051)
≥0.125～0.187(3.19～4.75)		0.003(0.076)
≥0.187～0.375(4.75～9.52)		0.004(0.102)
≥0.375～0.500(9.52～12.7)		0.005(0.127)
≥0.500～0.625(12.7～16.9)		0.007(0.178)
≥0.625～0.750(16.9～19.1)		0.008(0.203)
≥0.750～1.000(19.1～25.4)		0.010(0.254)
≥0.750～1.000(19.1～25.4)		0.015(0.381)
≥1.500～2.000(38.1～50.8)		0.020(0.508)
≥2.000～2.500(50.8～63.5)		0.030(0.762)

Niobium and hafnium alloys are usually prepared by the combination of electron beam smelting and vacuum white consumption arc smelting, then extrusion or forging at a temperature above 1200°C, and rolling at a temperature below 500°C And drawing and other processing, can be made into plates, strips, rods, wires and forgings and other products.

Niobium hafnium alloy welding
Niobium-hafnium alloys have good weldability. Usually, argon tungsten shielded welding and electron beam welding are used to realize the connection of parent metals. These two welding methods can also be used to complete the welding of niobium-hafnium alloys with titanium and titanium alloys.
The quality of the weld seam is related to the purity of the argon gas and the degree of vacuum. Generally, the higher the purity of the argon gas and the lower the residual atmospheric pressure, the better the quality of the weld seam.

Niobium and hafnium alloy heat treatment
Generally, vacuum or inert gas protection annealing treatment and solution aging treatment are used.

Niobium hafnium alloy coating
Cr-Ti-Si and Cr-Fe-Si series anti-oxidation coatings are usually used.
The niobium-hafnium alloy coated with these two coatings has an anti-oxidation life of more than 150h in the air at 1371°C.

Application of niobium hafnium alloy
Mainly used for radiation cooling nozzle extension and thrust chamber body of liquid rocket engine, molten sodium and sodium potassium alloy pressure tube and turbo pump of space power generation system, high temperature structural components of jet engine, etc.