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AISI D3 Tool Steel | DIN 1.2080 | GB Cr12
AISI D3 Tool Steel | DIN 1.2080 | GB Cr12 is a kind of cold work tool steel widely used, belonging to Ledeburitic steel with high carbon and high chromium. Quite good hardenability and wearing resistance, and small distortion after quenching. Not good impact toughness, be liable to fracture and form inhomogeneous eutectic carbides.
Dimensions
Round: dia.10-500 mm
Flat: 6-120 x 40-1000 mm
Block: 80-400 x 100-1000 mm
Delivery Condition
EAF+(ESR) or EAF+LF+VD+(ESR), Hot rolled or Forged, Annealed, Black surface or Machined surface, UT SEP1921 Class3 D/d
Equivalence
| AISI/SAE | DIN/W.Nr | JIS | GB | ||||||||
| D3 | 1.208 | SKD1 | Cr12 |
Chemical Composition(%)
| Steel Grade | C | Sl | Mn | P | S | Cr |
| 1.208 | 1.90-2.20 | 0.10-0.60 | 0.20-0.60 | ≤0.030 | ≤0.030 | 11.00-13.00 |
| D3 | 2.00-2.35 | 0.10-0.60 | 0.20-0.60 | ≤0.030 | ≤0.030 | 11.00-13.50 |
| Cr12 | 2.00-2.30 | ≤0.40 | ≤0.40 | ≤0.030 | ≤0.030 | 11.50-13.00 |
Applications
1. Common used for making cold work molds of excellent wearing resistance with light shock loads, such as punch heads, cold cutting scissors, drill bushes, gauges, wire drawing sheets, drawing dies, thread rolling dies etc.
2. Making cutting tools which is used for machining material of low hardness.
3. Used as plastic mold with good wearing resistance and long service life.
Forging Technique
| Heat Temperature | Start Forging Temperature | Finish Forging Temperature | Cooling Method | ||||||||
| 1120 - 1140 °C | 1080 - 1100 °C | 880 - 920 °C | Slow Cooling |
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. 250 HB.
Stress relieving
Approx. 650°C
Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. After through heating, hold in neutral atmosphere for 1-2 hours.
Hardening
940 to 970°C
Oil, salt bath (220 to 250°C or 500 to 550°C), compressed or still air if thickness does not exceed 25 mm and if hardening temperature is on the upper side of the range. 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
1 hour for each 20 mm of workpiece 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.
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.
