Basic Info.
Product Description
AISI D2 Tool Steel | DIN 1.2379
Ningshing Special-Steel is DIN 1.2379 / AISI D2 tool steel stockholders and suppliers from china. Over 25 years experience in supplying DIN 1.2379 / AISI D2 tool steel round bar, flat bar and plate.
AISI D2 Tool Steel | DIN 1.2379 is a kind of steel with good hardenability and wear resistance. High oxidation resistance, good corrosion resistance after quenching and polishing, small deformation after heat treatment.
Related Specifications ASTM A681 DIN EN 10083/3 JIS G4053 GB GB/T1299
Dimensions
Hot Rolled Round: dia.10-130 mm
Forged Round: 80-700 mm
Hot Rolled Flat: 6-120 x 40-1000 mm
Forged Block: 80-400 x 100-1000 mm
Delivery Condition
EAF+LF+VD+(ESR), Hot rolled or Forged, Annealed, Hardness≤255HB, Black surface or Machined surface, UT SEP1921 Class3 D/d
Equivalence
| AISI / SAE | DIN / W.Nr | JIS | GB |
| D2 | 1.2379 | SKD11 | Cr12Mo1V1 |
Chemical Composition (%)
| Steel Grade | C | Sl | Mn | P | S | Cr | Mo | V |
| 1.2379 | 1.45-1.60 | 0.10-0.60 | 0.20-0.60 | ≤0.030 | ≤0.030 | 11.00-13.00 | 0.70-1.00 | 0.70-1.00 |
| D2 | 1.40-1.60 | 0.10-0.60 | 0.20-0.60 | ≤0.030 | ≤0.030 | 11.00-13.00 | 0.70-1.20 | 0.50-1.10 |
Applications
For making different kinds of cold work molds with high accuracy and long service life, cutting tools and measuring instruments, such as complex-shaped piercing dies, threading screw plates, cold extrusion dies, cold cutting scissors, precision measuring tools etc.
Forging Technique
| Heat Temperature | Start Forging Temperature | Finish Forging Temperature | Cooling Method |
| 1120-1160 °C | 1050-1090 °C | ≥850 °C | Thermal Annealing |
Heat Treatment
Annealing
800 to 850°C
Slow controlled cooling in furnace at a rate of 10 to 20°C/hr down to approx. 600°C, further cooling in air.
Hardness after annealing: max. 255 HB.
Stress Relieving
650 to 700°C
Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or incomplex shapes. After through heating, hold in neutral atmosphere for 1 to 2 hours.
Hardening
1020 to 1040°C
Complex shapes/air, simple shapes/airblast, oil, salt bath from (220 to 250°C or 500 to 550°C). Holding time after temperature equalization: 15 to 30 minutes.
Obtainable hardness: 63 - 65 HRC.
Tempering
Slow heating to tempering temperature immediately after hardening/time in furnace
1hour for each 20 mm of work piece thickness, but at least 2 hours/cooling in air.
For average hardness figures to be obtained, please refer to the tempering chart.
For certain cases we recommend to reduce tempering temperature and increase holding
time. For certain applications requiring improved retention of hardness, a nitriding treatment is recommended
.
Q1: What is Ningbo Ningshing Precision Machinery Group Co., Ltd ?
A1: Ningbo Ningshing Precision Machinery Group Co., Ltd., formerly known as Ningbo Ningshing Special-Steel Group Co., Ltd., is the leading distributor of Special Steel, and also a professional mold base maker in China. Our business involves special steel trading, machining processing, mold base making, heat treatment, CNC machines manufacturing.
Q2: Are you a manufacturer or a trader?
A2: For Special Steel, we are the one of the leading distributors and service center in China. 9 warehouses with over 50,000 tons of regular stock. Our workshop has various kinds of equipments for sawing, milling, grinding, drilling etc.
For mold base, we are a professional manufacturer, with 24 sets of CNC machines, 3 axis and 5 axis, CMM for inspection. We produce medium-large sized mold base for plastic injection mold and die casting die.
Q3: How do you control the quality of steels?
A3: Firstly, we have very close and deep relationship with Chinese Prime Mills, choose supplier carefully, and regard them as the long term business partner. Based on the long term cooperation, we concentrate on special steel business and expand the market step by step. Secondly, we have own technical center which is formed by the experienced engineers and technicians whom ever worked for prime mills. We control the quality in production process, in-out warehouse.
Q4:: Which kind of processing can you do?
A4: We do machining processing like cutting, milling, grinding, turning, peeling, drilling, CNC machining. Meanwhile, we do vacuum heat treatment for die and mold.