Product catalogue
Related products
live a message
The 440 family of stainless steels is most typically offered in long forms—bars, wires, billets, coils, and tubes are the most common, but there may be others. These raw forms are the most conducive to metalworking with 440 steel.
Grade 440C stainless steel is a high carbon martensitic stainless steel. It has high strength, moderate corrosion resistance, and good hardness and wear resistance. Grade 440C is capable of attaining, after heat treatment, the highest strength, hardness and wear resistance of all the stainless alloys. Its very high carbon content is responsible for these characteristics, which make 440C particularly suited to such applications as ball bearings and valve parts.
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.
Not recommended for use in temperatures above the relevant tempering temperature, because of reduction in mechanical properties by over-tempering.
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.
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.
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.
Compostion
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
|---|---|---|---|---|---|---|---|---|---|---|
| 440C | min. max. | 0.95 1.20 | - 1 | - 1 | - 0.04 | - 0.030 | 16.00 18.00 | - 0.75 | - | - |
Mechanical Properties
| Tempering Temperature (°C) | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (% in 50mm) | Hardness Rockwell (HR C) | Impact Charpy V (J) |
|---|---|---|---|---|---|
| Annealed* | 758 | 448 | 14 | 269HB max# | - |
| 204 | 2030 | 1900 | 4 | 59 | 9 |
| 260 | 1960 | 1830 | 4 | 57 | 9 |
| 316 | 1860 | 1740 | 4 | 56 | 9 |
| 371 | 1790 | 1660 | 4 | 56 | 9 |
| * Annealed properties are typical for Condition A of ASTM A276# Brinell Hardness is ASTM A276 specified maximum for annealed 440A, B and C. | |||||
Physical Properties
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (mm/m/°C) | Thermal Conductivity(W/m.K) | Specific Heat 0-100°C (J/kg.K) | Electrical Resistivity (nW.m) | |||
|---|---|---|---|---|---|---|---|---|---|
| 0-100°C | 0-200°C | 0-600°C | at 100°C | at 500°C | |||||
| 440 C | 7650 | 200 | 10.1 | 10.3 | 11.7 | 24.2 | - | ||
Product Name | Stainless steel Coil,cold rolled ,hot rolled |
Standard | ASTM,AISI,SUS,JIS,EN,DIN,BS,GB |
Steel Grade | 201,202 301,304,304,304L,321316,316L,316TI TP304 TP316 317L 347 347H.2205 2304 309S,310S,904L 430,439,409, 436,443,410S,420,etc |
Thickness | 0.2-14mm or as customer request |
Width | 500-2000mm or as customer request |
Stock Dimension | 0.5mm-4mm x 1220mm; 1500mm x 2440mm/2500mm;5mm-25mm x 1220mm; |
Packing | Standard seaworthy package(wooden boxes package and other package) or follow the customer’s requirements. |
Application | Construction field, ships building industry, petroleum & chemical industries, war and electricity industries, food processing and medical industry, boiler heat exchange, Our stainless steel sheet can be made according the customer’s requirements. Quality assured.Welcome to your inquiry. |
We are happy to answer any questions you have regarding our product lines and services. Please tell us a little more about yourself and we will have someone contact you as soon as possible.
Speak to a Steel Expert
Behind the growth and success of Kuaima Steel is years of hard work and dedication in the steel industry and meeting customers' needs on time. Advanced technology, standard products, certified quality standards and the bestcustomer service make Kuiama Steel a true leader in the global market.
Quality & experience
Technology & Innovation
Team & Quality
Service & Support
| 201 304 316 stainless steel coil | stainless steel coil tubing uk |
| 201 antique stainless steel coil | stainless steel coil vape |
| 201 ba stainless steel coil | stainless steel coil wattage mode |
| 201 cold stainless steel coil | stainless steel coil west midlands |
| 201 cr stainless steel coil | stainless steel coiled pipe |
| 201 ddq stainless steel coil | stainless steel coiled tube uk |
Every industry has its unique set of material specifications and needs. That’s why you can count on the exceptional experience and industry knowledge of the professionals at Kuaima Steel - Meeting the Exact Needs of Every Industry That Uses steel.
Liaocheng Economic and Technological Development Zone, Shandong Province, China
WeChat
home
