1.2746 Air Oil Hardenable Special Cold Work Tool Steel

• Standard: ASTM, AISI, GB, JIS, DIN, BS
• Surface Treatment: Black, Machined
• Technique: Hot Rolled
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Silicon Steel
• Transport Package: Nude Packing
• Specification: check detailed description
• Model NO.: 1.2746
• Trademark: Ningbo Ningshing
• Origin: China

Product Description

DIN 1.2746/45NiCrMoV16-6 Cold Work Tool Steel


Dimensions
Round: dia.10-1000 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
----	1.2746	----	45NiCrMoV16-6

Chemical Composition(%)

Steel Grade	C	Si	Mn	P	S	Cr	Mo
1.2746	0.41-0.49	0.15-0.35	0.60-0.80	≤ 0.025	≤ 0.020	1.40-1.60	0.73-0.85

Heat Treatment
Annealing
800 to 850°C
Slow con trolled cooling in furnace at a rate of 10 to 20°C/hr down to approx. 600°C, further cooling in air.

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
950 to 980°C
Oil, salt bath (220 to 250°C or 500 to 550°C), air plast, still air. Holding time after temperature equalization: 15 to 30 minutes. 
Special treatment: Hardening 1020°C and tempering at 500°C.

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 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.