GR12 Rod Wire Sheet Pipe Characteristics and Application Standards
1. Introduction:
GR12 (Ti-0.3Mo-0.8Ni) titanium alloy is a corrosion-resistant titanium alloy. It is a near-alpha alloy developed to improve the crevice corrosion performance of pure titanium. The alloy contains 0.3% Mo and 0.8% Ni, which not only strengthens the alloy, but also has good crevice corrosion resistance to high temperatures, low pH chlorides or weakly reducing acids. Its corrosion resistance is significantly better than pure titanium and close to GR7 alloy. GR12 alloy also has good process plasticity and welding properties, and has been widely used in the chemical industry. The alloy is available in the annealed condition and main products include plates, rods, tubes, forgings and wire rods. Similar foreign brand Gr.12 (USA).
2. Chemical composition:
GR12 titanium alloy chemical composition mass fraction/%
|
Main ingredients |
Impurities, not more than |
||||||||
|
Ti |
Mo |
Ni |
Fe |
C |
N |
H |
0 |
Other ingredients |
|
|
single |
sum |
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|
margin |
0.2-0.4 |
0.6~0.9 |
0.30 |
0.08 |
0.03 |
0.015 |
0.25 |
0.10 |
0.40 |
3. Alloy properties:
The density is 4.54g/m3, the elastic modulus at room temperature is 103~107GPa, the hardness is HB180~215, and the phase transition point is 890±15℃.
Corrosion resistance: Nickel improves the crevice corrosion resistance of titanium in hydrochloric acid solution, but in reducing acids, the corrosion resistance of titanium-nickel alloy is lower than that of pure titanium. Appropriate addition of molybdenum to Ti-Ni alloy can improve its corrosion resistance in reducing media.
4. Performance of GR12 titanium alloy specified in technical standards
Technical standard variety status specification mm sampling direction Rm MpaRp0.2 MPaA %Z %a(°) not less than GB/T 3621-2007 plate M0.8～10.0LT485a 345b345a 275b18a 25b-105GB/T 3622-1999 tape, foil M0. 3～<0.5 0.5～2.0LT (L) 485-15c 18-90GB/T 26723-2011 Bar M0.3～<4.75L, T48534518
105YS/T 658-2007 Strip M0.4～2.1
48330018a
105GB/T 3623-2007 Wire M0.1～0.7L Actual measurement Actual measurement Actual measurement Actual measurement Actual measurement Actual measurement Actual measurement GB/T 3624-2010 Pipe M Outer diameter 3～110L46030018c--GB/T 3625-2007 Pipe M Outside diameter>10~80L46030018c--GB/T 2965-2007 Medium rod
Rectangular rod with a cross-sectional area not greater than 64.5cm2 and a cross-sectional thickness not greater than 76mm
|
technical standard |
Variety |
state |
Specifications mm |
Sampling direction |
M Pa |
RpO. 2 MPa |
A% |
Z% |
a(°) |
|
not less than |
|||||||||
|
GB/T 3621-2007 |
plate |
M |
0.8~10.0 |
LT |
485a 345b |
345a 2 75b |
18a 25b |
- |
105 |
|
GB/T 3622-1999 |
Ribbons, foils |
M |
0.3﹤0.5 0.5 ~2.0 |
LT (L) |
485 |
- |
15c 18 |
- |
90 |
|
GB/T 26723 -2011 |
Strip |
M |
0.3~<4.75 |
L,T |
485 |
345 |
18 |
105 |
|
|
YS/T6 58-20 07 |
Strip |
M |
0.4~2.1 |
483 |
300 |
18a |
105 |
||
|
GB/T 3623-2007 |
wire material |
M |
0.1~0.7 |
L |
Actual measurement |
Actual measurement |
Actual measurement |
Actual measurement |
Actual measurement |
|
GB/T 3624-2010 |
pipes |
M |
Outer diameter 3~110 |
L |
460 |
300 |
18c |
- |
- |
|
GB/T 3625-2007 |
pipes |
M |
Outer diameter》 10~8 0 |
L |
460 |
300 |
18c |
- |
- |
|
GB/T 2965-2007 |
Rod |
M |
The cross-sectional area is not greater than 64.5cm2 and the cross-sectional thickness of the rectangular rod is not greater than 76mm |
L |
485 |
345 |
18 |
25 |
- |
|
GB/T1 6598-1996 |
Cake ring material |
M |
The cross-sectional area is no more than 100cm |
C |
485 |
345 |
18 |
25 |
- |
|
a: Applicable to normal supply. b: Suitable for composite board composite materials. c: Gauge length is 50mm. |
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