Welding wire made of titanium gost SPT-2 alloy
|Grade of titanium alloy:||Titanium gost SPT-2|
|Alloy classification:||Deformable titanium alloy|
|Industrial usage of alloy:||Manufacture of titanium welded wire|
Percentage composition according to GOST 27 265 — 87
|up to 0.04||up to 0.003||up to 0.12||2.5 — 3.5||3.5 — 4.5||89.36 — 92.7||up to 0.1||up to 0.05||up to 0.15||1 — 2||others 0,3|
Note: titanium constitutes a basis of alloy; its percentage content is noted in table.
Mechanical characteristics (temperature is 20°С)
|Range of sizes||GOST||F.e.||KCU||Heat treatment.||d5||sT||sv|
|Titanium wire||27 265−87||Condition of supply||13||645−845|
Physical characteristics of alloy
|l||a 10 6||540||100°|
|r||18,85||E 10— 5||R 10 9||C||T|
Description of mechanical characteristics
|Flow limit at permanent change of form (proportional limit) [MPa]||sT|
|Brinell hardness [MPa]||HB|
|Contraction ratio (%)||y|
|Short resistance to rupture [MPa]||sv|
|Percent elongation at fracture [ % ]||d5|
|Impact hardness [kJ/m2]||KCU|
Wire is made in outgassing, pickled conditions. Out-of-roundness of welding titanium wire cannot be bigger than its diameter for limit deviation. Its surface must be clean and clear, without non-pickled places, black spots, colors of tarnish. Dark non-pickled places, minor tears, small guide marks, backfins of a depth that does not exceed sizes are allowed on a surface.
|Diameter||Permissible depth of defect beddings in a wire|
Small separate defects at wire diameter of up to 3.0 mm deep, exceeding the limit of 0.1 mm are allowed on a surface. Cleaning of contaminations and surface defects are done by means of pickling treatment and dressing for wire degassing. Further dressing of small separate contaminations and pickling treatment of certain repeated degassing are allowed as well. A general scope of macrosection with defined exceeding of defect depth during a process of metallographic examination cannot be higher than 10% of general scope of macrosection inspection lot.
Physical characteristics of titanium gost SPT-2
|Temperature at which are obtained actual characteristics||20°С|
|Lineal expansion coefficient α x 106 at 100 °C [1/ °С]||8.2|
|Elasticity module of 1 sort Е [MPa] x 10-5||1.12|
|Elongation on failure d5 %||13%|
|Short-term strength limit sv [MPa]||645−845|
|Specific electric resistance Оhm-mm2/m||1.6|
Titanium wire is rolled in coils. Its outer diameter must not exceed 900 mm. Wire waps must not stick together. There must not be present coil cambers of more than 100°. Distortion of titanium wire which appears at coil annealing is not a flaw. Coil weight along with a wire cannot be more than 50 kg. If coil is composed of a few pieces, a length of every piece must not be less than 10 m.
Mechanical characteristics of titanium wire must fully comply with requirements specified in a table.
|Grade of titanium alloy||Percentage extension, % not more than||Diameter, mm||Ultimate resistance MPa (kgf\mm sq.)|
|Titanium gost SPT-2||13.0||1.6 — 7.0||645−845 (66−86)|
Marking of wire:
Every coil with wire must have an attached to it mark that will define:
— number of batch and smelt;
— inspection stamp;
— release date;
— name of manufacturer and trade mark:
— conventional symbol of wire;
— marking of standard.
Every coil of wire must be tightly bounded with soft titanium wire. Then, it must be packaged in a clean paper and wraparound with bagging at the top. Wire that is rolled in coil must be joined with natural or synthetic binder according to requirements of standard technical documents.
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