Basic Info.
Standard
AISI, ASTM, DIN, JIS, GB, BS
Technique
Polishing, Etching, EDM, Nitriding, Hard Chroming
Surface Treatment
Polished
Special Use
Mold Steel, Industry
Application
Structural Steel Bar
Transport Package
Standard Sea Packing
Product Description
1 1.2312 Introduction
P20+S Plastic mold steel with excellent machinability properties because of the high S content, good toughness properties, good wear resistance, uniform hardness in all dimensions, dimensional stability, requiring no heat treatment, 280-325HB hardened and tempered condition, suitable for nitriding to increase wear resistance, not suitable for chrome plating, polishing and etch graining.
2 1.2312 Applications
P20+S Plastic Mold Steel is ideally suited for the production of moulds where improved machinability is required. Typical applications include die holders, zinc die casting dies, backers, bolsters and injection moulds. The versatility of this plastic mould tool steel with its high tensile characteristics enables uses for a variety of other applications such as shafts and wear strips.
:
ASTM A681 Standard Specification for Tool Steel
4 All Grades Comparison
ASTM A681 | Werkstoff |
---|
P20+S | 1.2312 |
5 Chemical Composition(%)
C | Si | Mn | P | S | Cr | Mo |
---|
0.35-0.45 | 0.30-0.50 | 1.40-1.60 | 0.030 max | 0.05-0.10 | 1.80-2.00 | 0.15-0.25 |
6 HEAT TREATMENT
Forging: Heat slowly, allowing sufficient time for the steel to become heated through. Begin forging at 1050°C. Do not forge below 930°C reheating if necessary. After forging, cool very slowly.
Annealing: Heat uniformly to 710-740°C. Soak well, cool slowly in the furnace.
Stress Relieving:When dies are heavily machined, we recommend stabilising just before finish machining in order to relieve machining strains. Heat to 460-500°C. Soak well and allow to cool in the air.
Hardening: Heat uniformly to 830-870°C until heated through. Quench in oil.
Tempering: Heat uniformly and soak at the tempering temperature for at least one hour per 25mm of section. Allow to cool in still air.
Tempering Temperature | Hardness(HRC) | Tensile Strength (Mpa) |
---|
100oC | 51 | 1730 |
200oC | 50 | 1670 |
300oC | 48 | 1570 |
400oC | 46 | 1480 |
500oC | 42 | 1330 |
600oC | 36 | 1140 |
7 Nitriding:
Tools machined from pre-hardened P20+S Plastic Mold Steel may be nitrided to give a wear resistant case of approximately Rockwell C60 surface hardness with a case depth of 0.35mm to 0.5mm. Nitriding also increases the corrosion resistance. After nitriding at 525°C in ammonia gas the surface hardness of the tool will be approximately 650HV.
Temperature | Time (hours) | Approx. Depth of Case (mm) |
---|
525oC | 20 | 0.3 |
525oC | 40 | 0.35 |
525oC | 60 | 0.50 |
Case Hardening: Tools produced from P20+S Plastic Mold Steel may be case hardened, which can achieve a surface hardness of between 55 to 59 Rockwell C.
Hard Chromium Plating: To avoid hydrogen embrittlement P20+S Plastic Mold Steel should be tempered for 4 hours at 180°C for 4 hours after hard chromium plating
Induction Hardening:Induction or flame hardening of will achieve a hardness of 50 to 55HRc. It is preferable to air cool, though smaller components may require forced cooling. Temper immediately after hardening.
The main grades of tool steel and special steel which we market are listed as follows:
Hot work steel:H13,H21,1.2714,etc.
Cold work steel:D2,D3,D6,01,A2,etc
Plastic Mould Steel:P20,1.2738,1.2083,1.2767,1.2312,1.2316 etc.
HSS:M2,M35,M42,etc.
AlloySteel:4140,42CrMo4,4130,4340,8620,5140,5160,6150,4135,52100,etc
Carbon Steel:Q235,Q345,1045,1084,etc
As a large-scale wholesaler and retailer,we have the excellent service organization and first-class marketing personnel.We have been specialized in domestic and overseas markets
for many years,and have established qood and stable business relationships with many overseas clients with
high-quality products,timely delivery,competitive price and good service,we have won high praises from all our customers.
We always insist on the idea of "The quality is firs.We sincerely hope to cooperate with more importers,and make
progress together.
Address:
Floor17, Xinlian Building, Wuxi, Jiangsu, China
Business Type:
Manufacturer/Factory, Trading Company
Business Range:
Construction & Decoration, Metallurgy, Mineral & Energy
Management System Certification:
ISO 9000
Company Introduction:
Zhongtong Weiye Special Steel Co., Ltd. is a professional and reputable steel manufacturer and exporter in Wuxi city, China. Wuxi is close to Shanghai, enjoys excellent geographic location and convenient water, land and air transportation. Wuxi become the biggest stainless steel sheet, plate and coil supply Center in China. Zhongtong Weiye as one of the largest stock-holder and manufacturers supply a complete range of Stainless steel, pipes, galvanized products, bars, strips, angle steel, nickel alloy, super alloys and other related products. The material is all famous brand including Shanxi Taigang Iron& Steel CO, . Ltd (TISCO), Zhangjiagang Pohang (ZPSS), Shanghai(BAO STEEL), Ningbo (Baoxin) etc. The company has a modern indoor warehouse, with nearly a thousand varieties in stock that is ready for same day dispatch from our warehouses. Products are mainly exported to Europe, America, Southeast Asia, the Middle East and other countries and regions. Generally, our products are widely applied in construction, bridge, car manufacturing, electrical installation and mining. We have won recognition from our clients due to our excellent credit and services. Zhongtong Weiye Special Steel Co., Ltd. Follows the tenet of "quality of survival, integrity and development". We commit to sell quality products and make quick delivery to our customers. We would like to use high quality products and excellent service to develop a bright future with our clients.
Different kinds of products are available in our company. We′re pleased to get your Inquiry and we will reply you as soon as possible. We stick to the principle of "quality first, service first, continuous improvement and innovation to meet the customers" for the management and "zero defect, zero complaints" as the quality objective.