Feature

Stainless steel grade 50Х14МФ is made according to international standard MSO 7153/1−88 and GOST R50 328 1−92. Included in the 14−15% chromium, 0.6% manganese and silicon, is 0.48−0.55% carbon 0,45−0,8% molybdenum, 0.1% to 0.15% vanadium, thousandths of a percent of phosphorus and sulfur. The balance is iron. The quality of the brand 50Х14МФ normalized ISO 7153/1−88, as well as GOST R50 328.1−92 (surgical Tools. The metallic materials. Part 1. Stainless steel). NGO «medinstrument», Medical-instrumental plant. Lenin (Vorsma) produced the all-metal knives from this steel. There were held all necessary medical tests which had positive results.

Manufacture and processing of

This steel refers to the martensitic class. It is smelted in open electric arc furnaces, vacuum induction furnaces with subsequent vacuum arc remelting. Steel is hardened by quenching through the martensitic transformation. Annealing gives it the structure of granular perlite, after quenching the hardness is 197−207 N. Increasing the quenching temperature increases the proportion of residual austenite. Maximum hardness is achieved at t° 1050 °C. This steel is easily subjected to hot deformation at a temperature of 900 — 1100 °C. the blanks are made by rolling, varietal — drawing.

Application

Manufacturer of cutting tools, for example, all-metal scalpels, detachable surgical blades, kitchen knives. These products meet the high requirements of corrosion resistance, can withstand repeated heat treatment. It is important for medical instruments. They can be processed in the washing machine, do not deteriorate in chlorinated water.

For alloy 50Х14МФ exist such THAT:

1) 14−130−280−96;

2) 14−1-3909−85.

Percentage composition of the brand 50Х14МФ (GOST 5632−72)

Normalized mechanical properties of the alloy at 20 °C

Notes: 1. Delivery status (for example, in the soft state after annealing or after the holidays, according to the technology manufacturer).
2. The mode of heat treatment of samples of products under the control of the hardenability.

Corrosion resistance

If you compare the steel with the brand 50Х14МФ 100Х13М, the first after quenching and tempering has high resistance to pitting corrosion in chlorine environments.

Resistance to pitting corrosion

1. Test solution (1% NaCl and 3% (NH4)2S04) 1000 h (rod Ø 8 0 mm, quenching + low tempering)

Potentiostatic etching in 1% NaCl solution at φ= -50mV (sheet size 3−6 mm, quenching + low tempering)

Scalpels, made of steel 50Х14МФ resistant to treatment cycles, which include disinfection, pre-sterilization cleaning and sterilization. In clinical trials scalpels of the steel is aged for about 4 transactions, while the scalpels of steel 100Х13М — only 2 operations (according to NGOs medinstrument, Kazan). Knives that are made from this steel can be processed in the washing machine even in the presence of water chlorine ions.

Physical qualities depending on the temperature

σ_in the Limit of short-term strength, [MPa]

δ₅, the elongation at break, [ % ]

ψ is the Relative narrowing [ % ]

Non-standardized tests effect of heat treatment on the consumer properties of Cutlery

Note to table: the initial thickness of the edge of the blade is 0.1 mm.

Structure brand 50Х14МФ

This steel refers to the martensitic class group of hypereutectoid steels. It hardened after quenching the result of the martensitic transformation. After full annealing, the steel has a structure of granular pearlite, and its hardness is 197−207 HB.

Requirements for the microstructure according to the standard GOST 8233−56

Note to table: the depth bezoperatsionnogo layer is determined according to GOST 1763−68.

50Х14МФ microstructure of steel, which is hardened with 900−1200 °C, consists of austenite, martensite and carbides. When the temperature of heating for hardening, the amount of residual austenite (γ) increases, and the hardness change during this extreme.
A maximum of 57,5 HRC hardness corresponds to the quenching temperature of approximately 1050 °C.

The hardness value is dependent on the quenching temperature

The influence of the temperature break on the hardness and quantity of residual austenite in the steel 50Х14МФ (quenching temperature equal to 1050°C)

The critical point of the steel for the initial annealed state the following:

1) Ac1 = 860 °C;

2) Ac3 = 907 °C.

After quenching from 1050 °C austenite grain size No. 9 according to the standard GOST 5639−65, and the size of carbides is 1.5−8 mm.

Technological parameters

This steel is easily deformed in a hot condition at a temperature of from 1100 to 850 °C. But note that with the rapid cooling of the steel prone to cracking. Sheets and strip are made of hot/cold rolling and steel bars — by drawing initial billets. Heat treatment is conducted for the following parameters: t° tempering 1045 °C; t° leave 200 °C.

Supply

All products are brand 50Х14МФ certified. In the technical documentation included data on chemical composition, limiting the percentage of impurities; mechanical qualities of the products. We can buy in bulk any semi-finished products for large-scale production. We also offer optimal conditions for retail customers. A high level of service and speed of service are the face of our company.

Buy at best price

In stock, LLC «Evek GmbH» has a range of stainless alloys. Supply certified products of domestic and foreign manufacturers. Our staff members are always happy to provide expert assistance in the choice of metal. We employ some of the most experienced managers. Strict adherence to standards of production, excellent product quality and minimum turnaround times are the face of our company. For regular customers entered the discount discount.