| Customization: | Available |
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| After-sales Service: | Yes |
| Warranty: | Three Years |
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1: GB T7A steel introduction
T7A is a steel grade of carbon tool steel. The steel toughness is good, chip processing is good, cheap, easy source, hardenability, wear resistance is low, quenching cavity shrinkage tendency is weak, quenching deformation is larger, tempering stability is poor, the hardening depth of water quenching 15-18mm, oil quenching 5-7mm. suitable for the production of easy quenching of small parts, large parts due to the hardening of the layer is shallow and thin, prone to arc cracking.
| Country | China | Japan | Germany | ISO |
| Standard | GB/T 1299 | JIS G4401 | DIN (W-Nr.) | ISO4957:1999 |
| Grade | T7A | SK70 | C70W2/1.1520 | C70U |
| Grade | C | Si | Mn | P | S |
| T7A |
0.65-0.74 |
0.35Max |
0.40Max |
0.035Max |
0.03Max |
| DIN 1.1520 | 0.65-0.74 | 0.1-0.3 | 0.1-0.35 | 0.03Max | 0.03Max |
| JIS SK70 | 0.65-0.75 | 0.1-0.35 | 0.1-0.5 | 0.03Max | 0.03Max |
The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, kindly contact the salesman.
| Size | Round | Dia 6-1200mm |
| Plate/Flat/Block | Thickness 6mm-500mm |
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| Width 20mm-1000mm |
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| Process | EAF+LF+VD+Forged+Heat treatment(optional) | |
| Heat treatment | Normalized ; Annealed ; Quenched ; Tempered | |
| Surface condition | Black; Peeled; Polished; Machined; Grinded; Turned; Milled | |
| Delivery condition | Forged; Hot rolled; Cold drawn | |
| Test | Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc. | |
| Payment terms | T/T;L/C;/Money gram/ Paypal | |
| Trade terms | FOB; CIF; C&F; etc.. | |
| Packing | Standard packages or as per customers request. | |
| Delivery time | 30-45 days | |
| Application | T7A is used in the manufacture of tools that are not subjected to high impact loads and require appropriate hardness and wear resistance, as well as good toughness, such as forging dies, chisels, hammers, punches, metal shear knives, reaming drills, steel seals, carpentry tools, wind tools, machine tool tops, pliers, drilling and chiseling tools, and blunt surgical and medical appliances. | |
6: Heat Treatment
Normalizing specification: temperature 800-820 ºC, out of the air-cooled, hardness 229-285HBS.
Ordinary annealing specifications: (740-750) ºC × (2-4) h, <30 ºC / h of the cooling rate, slow furnace cooling to a temperature of 500-600 ºC, out of the air-cooled.
Isothermal spheroidal annealing specifications:
(740-750) ºC × (2-4) h, (650-680) ºC × (4-6) h, after the furnace cooling to 500-600 ºC, out of the air-cooled, hardness ≤ 187HBS.
(750-770) ºC × (1-2) h, (680-700) ºC × (2-3) h, after the furnace cooled to 500-600 ºC, out of the air-cooled, hardness 163-187HBS, pearlitic 1-5 grade.
Quenching, tempering specifications: quenching temperature 730-760 ºC, water cooling, water-oil dual-liquid cooling or alkali bath cooling, quenching hardness 57HRC. tempering temperature 160-180 ºC.
For hot rolled plate, usually the delivery condition is hot rolled, annealed, 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.
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