China Hot Cold Rolled Carbon Steel Plate S55c C55 1055 En9 070m55

Hot/Cold Rolled Carbon Steel Plate S55C C55 1055 EN9/070M55

1: 1055 steel introduction
1055 steel is an unalloyed medium carbon engineering steel which has 0.52%-0.6% Carbon as per EN10083 standard.It will obtain high hardness and high strength after hardening due to the relatively high carbon content,and also can be flame or induction hardened to surface hardness Min 58HRC.C55 steel is generally supplied in an untreated or normalised condition
2.Chemical Composition
GradeCMnPSSiCrMoNiCr+Mo+NiC55/1.05350.52-0.60.60-0.90≤ 0.045≤ 0.045≤ 0.4≤ 0.4≤ 0.1≤ 0.4≤ 0.63C55E/1.12030.52-0.60.60-0.90≤ 0.03≤ 0.035≤ 0.4≤ 0.4≤ 0.1≤ 0.4≤ 0.63C55R/1.12090.52-0.60.60-0.90≤ 0.030.02-0.04≤ 0.4≤ 0.4≤ 0.1≤ 0.4≤ 0.63
3.Relevant Standards
USAUKChinaJapanAustralia1055070M55 / EN955#S55C1055
4: 1055 steel mechanical properties
Mechanical properties a at room temperature in the quenched and tempered condition (+QT)Diameter d mm≤ 1616-4040-100Thickness t mm< 88-2020-60Yield Strength Mpa≥550≥490≥420Tensile Strength Mpa800-950750-900700-850Elongation, %≥12≥14≥15Reduction of area ,%≥30≥45≥40
Mechanical properties a at room temperature in the normalized condition (+N)Diameter d mm≤ 1616-100100-250Thickness t mm≤ 1616-100100-160Yield Strength Mpa≥370≥330≥300Tensile Strength Mpa≥680≥640≥620Elongation, %≥11≥12≥12
5: 1055 steel overviews
SizeRoundDia 6-1200mmPlate/Flat/BlockThickness
6mm-500mmWidth
20mm-1000mmHeat treatmentNormalized ; Annealed ; Quenched ; TemperedSurface conditionBlack; Peeled; Polished; Machined; Grinded; Turned; MilledDelivery conditionForged; Hot rolled; Cold drawnTestTensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc. Payment termsT/T;L/C;/Money gram/ PaypalTrade termsFOB; CIF; C&F; etc..Delivery time30-45 daysApplication1055 is a medium carbon steel suitable for various type of applications where high strength is needed.It is used for components of small cross section requiring low tensile strength, and heavy forgings in the normalized condition for automotive and general engineering such as axles, clutch members, shafts, pressed and punched parts, piston rods and gear racks.
6: HEAT TREATMENT
ANNEALING
As mentioned above, forgings may be transferred to a furnace at a temperature that may approximate to the forging finishing temperature. The full annealing cycle of this grade is a soak at a temperature of 1450-1600oF (790-870oC) cooling to 1200oF (650oC) at 50oF (28oC) per hour, soaking and subsequently air cooling.
NORMALIZING
This steel will on occasion require normalizing prior to further heat treatment such as hardening and tempering. This is carried out at a temperature of 1650oF (900oC) followed by air cooling.
HARDENING
This steel is austenitized at 1475-1550oF (800-845oC) followed by water or oil quench depending upon section size and complexity.
TEMPERING
This steel will be tempered at a temperature to give required mechanical properties, based on past experience. It should be noted that there is a danger of temper brittleness in the temperature range of 500-600oF (260-315oC.)7: Delivery condition
For hot forged bar, usually the delivery condition is hot forged, annealed/QT, rough turned/Black surface.
For hot rolled bar, usually the delivery condition is hot rolled, annealed/QT, Black surface.
For Cold Drawn bar, usually the delivery condtion is cold drawn, annealed/QT, peeled/black surface
For hot rolled plate, usually the delivery condition is hot rolled, annealed, milled/black surface
For hot forged plate, usually the delivery condition is hot forged, normalized/annealed, milled/black surface.
Hunan Qilu Industrial Co., Ltd has the capacity to forge round steel, steel flat, square steel, module, shaft and roller, etc. The main specifications of the products include Φ80-1000mm forging materials and 80-1200mm square billets and which the maximum piece weight can reach 50T.

Hunan Qilu Industrial Co., Ltd were already engaged in exporting steel for 11 years, could supply a great variety of hot forged, hot rolled and cold drawn Steels, including engineering steel, cold work tool steel, hot work tool steel, plastic mold steel, spring steel, high speed steel, stainless steel etc., besides Qilu Industrial also has their own heating treatment shop and machining shop to provide heating and cutting service.
Since 2008 year, Hunan Qilu Industrial has the right to export all FORGED STEEL behalf of Qilu Speical Steel Co.,ltd which is specialized in smelting and forging of special steel since 1965 year, now Qilu special steel is one of the biggest manufacturer of forged product in China.The forged products are used in Automotive, Aerospace, Power Generation, Oil & Gas, Transportation and Industrial. We already set up the warehouse in Wuxi and Dongguan city, more than 20000 tons ex-stock could be supplied with kinds of size.
Qilu Industrial is the professional one-stop steel manufacturer, stockist and exporter in China, our customers spread all over the world, include West Europe, North America, South America, Asia, Middle Asia, Africa, Australia, etc.

The company owns advanced special steel smelting facilities and forging processing equipments, the main steel-making equipment include 2 sets of 50t ultra-high power electric arc furnaces,2 sets of 60t LF refining furnaces,1 set of 60t vacuum degassing refining furnace and 4 sets of 1-20t electroslag re-melting furnaces.
The main forging equipments mainly include:3 sets of 5t electro-hydraulic hammers, 1 set of high-speed forging units of 800t,1600t,2000t and 4500t respectively.

Any interests in our company and products, please feel free to contact us for quotation. We warmly welcome you to our factory.
Hunan Qilu Industrial CO., LTD
Web: www.qilucs.com