AISI 1055, 1.1203, DIN Ck55,
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Specification, Chemical & Mechanical Performance
We can produce 1.1203, DIN Ck55, AISI 1055 stainless steel round rods, 1.1203, DIN Ck55, AISI 1055 forging,sheet,coil,and profiledstrip,Deformed steel,flat steel,mould,steel wire,have all specifications. With DuoNian production experience, strict control 1.1203, DIN Ck55, AISI 1055 chemical composition and 1.1203, DIN Ck55, AISI 1055 mechanical properties.From casting, forging, steel to hot and cold rolling process, heat treatment, etc, we have the control of professional engineers. We have advanced precision machining equipment, according to the requirements of users machining. in order to achieve the most satisfied with the user requirements.
Production specification
Round bar steel: 1mm to 3500mm
Square-shape steel: 1mm to 4000mm
Plate steel:0.1mm to 4000mm
Width: 10mm to 2500mm
Lenth: We can supply any lenth based on the customer's requirement.
Forging: Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes
Tubings: OD: φ6-1800mm, with wall thickness ranging from 1-35 mm.
Finished goods condition: hot forging/hot rolling + annealing/normalizing + tempering/quenching + tempering/any conditions based on the customer's requirement
Surface conditions: scaled (hot working finish)/ground/rough machining/fine machining/based on the customer's requirement
Furnaces for metallurgical processing: electrode arc + LF/VD/VOD/ESR/Vacuum consumable electrode.
Ultrasonic inspection: 100% ultrasonic inspection for any inperfections or based on the customer's requirementExcellent service for all kinds of industries,with advantages of technologies, equipment and price.
We serve you with our honesty, integrity, and professionality.
Designation by Standards
| Brand Name | Ravne No. | Mat. No. | DIN | JIS | AISI |
| CK55 | 621 | 1.1203 | Ck55 | S55C |
1055 |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.56 | max. 0.40 | 0.75 | max. 0.40 | max. 0.10 | max. 0.40 | - | - | (Cr+Mo+Ni) = max. 0.63 |
Description
CK55 steel has a higher (0.55%) carbon content for greater strength than the lower carbon alloys. It is hardenable by heat treatment, quench and tempering.
Applications
Steel for springs, for quenched and tempered springs, for surface hardened products like shafts, bushings, crankshafts, etc.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.85
Soft Annealing
Hardness after soft annealing is 229 HB.
Normalizing
Normalizing temperature: 825-865oC.
Hardening
Harden from a temperature of 840-870oC, 850-880oC followed by water or oil quenching.
Tempering
Tempering from the quenched condition may be done at 540-680oC depending upon the strength desired.
Mechanical Properties in Hardened+Tempered Condition
| Diameter (mm) | 0.2 % proof stress (N/mm2) | Tensile strength (N/mm2) | Elongation A5(%) | Reduction Z (%) |
| up to 16* | 540 | 780-930 | 12 | 25 |
| 17-40 | 460 | 740-890 | 14 | 35 |
| 41-100 | 420 | 700-850 | 15 | 40 |
| up to 16 | 430 | 630-780 | 17 | 40 |
Forging
Hot forming temperature: 1100-850oC.
Machinability
Machinability is good, rated at 50% that of the AISI 1112 alloy used as a 100% machining rated steel.
Corrosion Resistance
This is a steel alloy and will rust if not protected. it is not corrosion resistant.
Welding
CK55 steel is weldable by all of the welding methods. However with its higher carbon content it is important to use both pre-heat at 150 to 260oC and post-heat at 590 to 650oC practice per an approved welding procedure.
Cold working
In the annealed state the CK55 alloy is readily cold worked by conventional methods.
Mechanical properties
Heat treatment
