440A / 440B / 440C ROUND BAR

Stainless Steel Bars, Steel Manufacturers440c / 1.4125 / 4125 Stainless Steel. In the highly competitive world of manufacturing, sourcing high quality materials is essential. sagar steels, specialize in 'no-compromise' manufacturing using state of the art CNC equipment. We are also the India's largest independent stockholder of hot work tool steels. From the experience gained in buying high quality tool steel, Intoco have added a further steel to their range, this being a Chromium martensitic steel called 440C/1.4125/4125 Stainless Steel. Its very high carbon content is responsible for these characteristics, which makes 440C/1.4125/4125 particularly suited to such applications as ball bearings, rollers and valve parts. Din 1.4125 - X105CrMo17. AISI 440c AMS 5618/5630 UNS S44004 AFNOR Z100CD17 JIS SUS 440C UNI X102CrMo17 KU/X105CrMo17. 440C/1.4125/4125 Stainless Steel at sagar steels now hold stock in rolled/forged bar that can be cut to length as required. We now also accept customer make to order in grade aisi - 440c /din - 1.4125 / en - 4125 / uns - 440044

One of the preferred option for metal alloys chosen by almost all industries is 440C bars. These products are capable to sustain the hardness, toughness, and strength and resistance power after heat treatment given for a long time. Due to the presence of carbon content at a greater extent in these products, they exhibit excellent mechanical characteristics and are well suited for the applications as ball bearings and valve parts.

The main and single difference between 440A & 440B is in the amount of carbon content (0.60 - 0.75% and 0.75 - 0.95% respectively), the latter have lower attainable hardness but higher corrosion resistance. Although all three versions of this grade are standard grades, in practice 440C is more available than the A or B variants

Corrosion Resistance

Good resistance to the atmosphere, fresh water, foods, alkalies and mild acids. Best resistance in the hardened and tempered and passivated condition. A smooth polished surface also assists. The corrosion resistance of grade 440C approximates that of grade 304 in many environments.

Heat Resistance

Not recommended for use in temperatures above the relevant tempering temperature, because of reduction in mechanical properties by over-tempering.

Heat Treatment

Annealing - Full anneal - 850-900°C, slow furnace cool to about 600°C and then air cool. Sub-critical Annealing - 735-785°C and slow furnace cool.

Hardening - Heat to 1010-1065°C, followed by quenching in warm oil or air. Oil quenching is necessary for heavy sections. Immediately temper at 150-370°C to obtain a wide variety of hardness values and mechanical properties as indicated in the accompanying table.

Tempering in the range 425-565°C is to be avoided because of reduced impact resistance and corrosion resistance. Tempering in the range 590-675°C results in lower hardness (the product become machinable) and high impact resistance.

Welding

If welding is necessary pre-heat at 250°C and follow welding with a full anneal. Grade 420 filler will give a high hardness weld (although not as high as the 440C), but 309 or 310 will produce soft welds with higher ductility.

Machining

In the annealed condition this grade is relatively easily machined; approximately the same as for high speed steel. Chips are tough and stringy so chip breakers are important. If these grades are hardened machining becomes more difficult and probably impossible.

Applications

• Typical applications include:
• Rolling element bearings
• Valve seats
• High quality knife blades
• Surgical instruments
• Chisels.