Special Steel P20+S/ 1.2312 round bar for Plastic Mould
P20+S /1.2312 steel is Chrome-manganese-molybdenum steel for hardening in air or in oil with very good hardenability and good firmness during the heat. It is well-workable during the heat and due to an increased content of sulfur well-workable both in the soft-annealed state and the heat-treated state. The steel has good polishability, it can be cemented in the bath or in gas and also put on the hard-chrome.
1, The main performance
P20+S/1.2312 round bar, flat bar, plate and block. As an alloy tool steel grade P20+S/1.2312 is commonly supplied in the hardened and tempered condition with a supply hardness of approximately 300HB. This steel gives an excellent polished finish and is one of the most widely accepted specifications for machine cut plastic moulds and zinc die casting dies. This grade gives excellent wear resistance but if maximum surface hardness is required for compression moulding plastic dies or similar tools, the steel can be case hardened or nitrided.
It has excellent hardening depth and good machinability,delivery to pre hardened and tempered condition,sulfur content is higher than 1.2311.Can impose nitriding processing(about 800HV), plating Nickel or chrome.
2, Application
Mainly used for the degree of thefamily which do not require extreme large plastic moulds,used as a low melting point of die holder,mould base, etc
3, Grade
| W.Nr |
DIN |
AFNOR |
AISI/SAE |
GB |
| 1.2312 |
X40CrMnMoS8-6 |
(40CMD8S) |
P20+S |
4Cr2MnMo |
4, Chemical composition(%)
| C |
Mn |
Si |
Cr |
Mo |
Ni |
S+P |
| 0.35-0.45 |
1.40-1.60 |
0.30-0.50 |
1.80-2.00 |
0.15-0.25 |
0.05-0.10 |
0.015 |
5, Phase transition temperature
6, The hardness of delivery
| Pre-hardened and tempered |
HB278-325(950-1100N/mm²) |
7, Heat treatment
| Annealing |
1)Heated to 720-750°C,two to four hours heat preservation,
2)Furnace cooling |
| Stress relief |
1)Heated to 560-650°C and then two to four hours heat preservation
2)Furnace cooling or air cooling |
| Pre hardened |
1)Preheat to 600-650°C
2)Heated to hardening temperature 840-840°C and heat preservation
3)Oil cooling
4)Hardness:HRC51 |
| Drawing temper |
1)Immediately after quenching
2)When the 580-650°C,with the 1/inch to heat preservation |
8, Delivery Date
For abundant stock, 7-15 days.
For customized products, 30-50 days.
9, Package: We provide standard export packing or according to customers' request.
10, About us
About us:
Guangzhou ChangFeng Steel Co., Ltd. is a professional special steel company, which specialized in exporting mould steel products based in China. With more than 20 years experience in special steel industry, our main products are Plastic Mould Steel, Hot Work Mould Steel, Cold Work Mould Steel, Alloy Structural Steel, Tool Steel, Stainless Steel, Carbon Steel and Forged Block.
To ensure provide high quality products to customers, we have close cooperation with many Chinese first class special steel enterprises, including Baosteel Group, Dongbei Special Steel, Changcheng Special Steel, Hongsheng Heavy Industry, Xingcheng Special Steel, Daye Special Steel.
We have thousand tons of stock materials in our own factory and also can provide processing services to customers. We are full of export experience for many years, the product covers America, Germany, France, Italy, Turkey, Singapore, Thailand, Malaysia, Vietnam, Taiwan, and Middle-East.
After years of development, the company has established a complete quality management and export service system. We have a group of experienced and competent elites and is capable of offering the best service to clients.
Our company equips with large-sized Vertical saw machines, Horizontal saw machines, Milling machines, Grinding machines and other advanced equipments to provide customers with cutting and other processing services.
All the products should be inspected the metallographic analysis, hardness, ultrasonic flaw detection and other strict inspection processes, which meet the standards of DIN, AISI, JIS and GB to ensure their function and quality.
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