SU908921A1 - Martensite ageing tool steel - Google Patents

Description

(54) TOOL-MAKING-LASTING

STEEL

one

This invention relates to the metallurgy of steels used for the production of medical injection needles.

Famous steel 12 x 18H10T, used for the manufacture of medical instruments, cops 1.

This steel has high technological plasticity, good weldability and corrosion resistance.

The disadvantage of steel is the low hardness of injection needles made from it, as a result of which they have relatively low elastic properties and wear resistance.

The closest in technical essence and the achieved effect to the proposed is steel 000X1Sh10M2T2 (EP-853), t2, containing, wt.%: CarbonUp to 0.03

Chrome10-11.3

Nickel9-10,3

Molybdenum1,8-2,3

Titan1,7-2,1

Aluminum up to 0,2

BorDo 0.002

Zirconium Up to 0.08

Calcium Up to 0.06

IronErest

This steel, after cold plastic deformation and aging, possesses high hardness, good anticorrosive properties.

The disadvantage of steel is that its minimum hardness is higher than

10 300 Hv, so that the cold rolling and drawing of products from this steel are difficult. In addition, during welding, a substantial increase in hardness occurs in the zone of influence of the weld (up to Hv 390-430),

15 as a result, without subsequent quenching, the steel cannot be cold rolled and drawn, and in a number of cases it is necessary.

The purpose of the invention is to increase the ductility in the quenched state.

For this purpose, steel containing iron, carbon, nickel, chromium, molybdenum, titanium, additionally contains 3 vanadium, copper, cerium at the following ratio of components, wt.%: Carbon .0.01-0.05 Chromium12-15 Nickel9 -12 Molybdenum 1,5 -2,5 Titanium 0,8 -2,0 Copper 0,8 -2,0 Vanadium 0.05 -0.3 Cerium 0,005-0,15 Iron Others The steel produced of the following composition is given in table. 1. Steels are made in an open induction furnace. After quenching from 950-1000 ° C and two-hour tempering at 470-480 ° C, they have the following properties. The results of testing their mechanical are given in table. 2. As can be seen from the table, the steel described has, after quenching, a significantly lower hardness (Hv 140-150) compared to and

150

45 42 50 140 140

300

eleven

table 2

65 67 62

450 480 530

114

560 is known that it allows rolling it into a cold one with a reduction rate of up to 80-S without intermediate grinding treatment (quenching). In addition, since after quenching from 950-1000 ° C, the steel has an almost completely austenitic structure, there is no increase in hardness in the zone of influence of the welded isha. The hardness of the coated steel after tempering (aging) at 470480 ° C is Hv 450-530, which is very close to the hardness values of the less-plastic known steel (Hv 560). The economic effect from the use of new steel is determined by the significantly higher yield of suitable metal at the stages of cold rolling and drawing, as well as by reducing the number of intermediate softening hardening due to its greater technological plasticity. The steelmaking technology of the proposed steel does not vary compared with that used for the known steel. Table 1

$ 9089214

Claims (1)

The formula of the invention Nickel 9 -12 Instrumental pattern of titanium 0.8 -2.0 steel containing carbon, chromium, nickel. Copper, o, 8 -2.0 molybdenum, titanium and iron, differ- $ vanadium 0.05-0.3 Shch with the fact that, with a chain of new E 0.005-0.15 ductility in the hardened state, it is Iron. The rest additionally contains copper, vanadium, cerium with the following ratio of components. Sources of information, wt.%: Taken into account during examination Carbon 0.01-0.051. Steel 12X18H10T, GOST 5632-72; rum 12-152. Steel EP-853, TU-14-131-173-74. Molybdenum 1.5 -2