Oil quenching is done to the ASTM A479 UNS S44004 hex bar to maximize its hardness properties. Heat treatment not only increases its hardness but the mechanical strength and wear resistance of the grade ASTM A276 type 440C flat bar also greatly boosts. One of the peculiarities of this alloy grade is that once it has been hardened, the AISI 440C threaded bar can hold a sharp edge and fight corrosion.
Controls on the mirror finish can be attained with a procedure as simple as polishing. Contra austenitic grades, 440C stainless steel rods are moderate resistance corrosion material compared to alloy 304. Even though this grade of stainless steel is hardenable through the use of a heat treatment procedure, machining is preferred on the DIN 1.4125 square bar in an annealed condition. This is so because it is easily machined in an annealed condition because the SS 440C bright bar tends to be very difficult once the alloy has been hardened.
440C Stainless Steel Round Bar Equivalent Grades
STANDARD | UNS | WNR. |
---|---|---|
SS 440C | S44004 | 1.4125 |
Specification of Stainless Steel 440C Round Bar
Stainless Steel Round Bar Specification : ASTM A276 / A479, ASME SA276 / A479
Dimension Standard : EN, DIN, JIS, ASTM, BS, ASME, AISI
Size : 14mm-300mm
Thickness : 50 mm to 6000 mm Long
Length : 1 To 6 Meters, Custom Cut Length
Form : Round, Square, Hex(A/F), Rectangle, Billet, Ingot, Forging Etc.
Chemical Alloyion of Stainless Steel 440C Round Bar
Grade | C | Mn | Si | P | S | Cr | Ni |
---|---|---|---|---|---|---|---|
440C | 0.95 - 1.20 | 1.00 max | 1.00 max | 0.040 max | 0.030 max | 16.00 - 18.00 | - |
Mechanical Properties Of Stainless Steel 440C Round Bar
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 440C, B and C. |
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