Alloy Steel with H11 flat bar SKD61 AISI Hot Work Tool Steel Flat Bar Steel Sheet Plate Block Round

Product Description

Alloy Steel with H11 flat bar SKD61 AISI Hot Work Tool Steel Flat Bar Steel Sheet Plate Block Round 

Ningshing Special-Steel have over 20 years for supplying high quality of Hot Work Tool Steel DIN 1.2343 / AISI H11. It is widely used for making die casting dies, hot forging dies, plastic mold with high hardness and polishing-ability. We can also offer DIN 1.2343 in Q+T condition, which is used for low pressure die casting dies.

1.2343 tool steel consists of less vanadium than the steel grade 1.2344. It gives 1.2343 steels the higher toughness, with some reduction in wear resistance and temper resistance. 1.2343 tool steel is a deep-hardening, air-hardening steel and 1.2343 alloy steel could be deep hardened by heat treatment and air-quenching. It gives minimal size change during heat treatment. 1.2343 how work steel also has super resistance to thermal fatigue cracking and superb resistance to gross cracking and thermal shock when water cooled in service.

Dimensions
Flat: 6-120 x 40-1200 mm


Delivery Condition
EAF+LF+VD+(ESR), Hot rolled or Forged, Spheroidizing Annealed, Black surface or Machined surface, UT SEP1921 Class3 D/d

Equivalence

AISI / SAE	DIN / W.Nr	JIS	GB
H11	1.2343	SKD6	4Cr5MoSiV

Chemical Composition(%)

Steel Grade	C	Si	Mn	P	S	Cr	Mo	V
1.2343	0.33-0.41	0.80-1.20	0.25-0.50	≤ 0.030	≤ 0.030	4.80-5.50	1.10-1.50	0.30-0.50
H11	0.30-0.43	0.80-1.20	0.20-0.50	≤ 0.030	≤ 0.030	4.75-5.50	1.10-1.60	0.30-0.60

Characteristics
1. DIN 1.2343 is a 5% chromium hot work steel that is characterized by excellent impact toughness. It contains less vanadium than DIN 1.2344. This provides for the higher toughness, with some reduction in wear resistance and temper resistance.
2. Deep-hardening, air-hardening steel that exhibits minimal size change during heat treatment.
3. Good resistance to thermal fatigue cracking (heat checking) and excellent resistance to gross cracking and thermal shock when water cooled in service.

Applications
Heavy duty hot work tools and dies, mainly for light alloy processing: mandrels, dies, and containers for metal tube and rod extrusion; hot extrusion equipment; tools and dies for the manufacture of hollow bodies, screws, rivets, nuts and bolts. Die casting equipment, forming dies, die inserts, hot shear blades, and plastic mould dies.

Forging Technique

Heat Temperature	Start Forging Temperature	Finish Forging Temperature	Cooling Method
1020-1150 °C	1100-1120 °C	900-850 °C	Pit or Sand Cooling

Heat Treatment
Annealing
750 to 800°C (1382 to 1472°F)
Slow controlled cooling in furnace at a rate of 10 to 20°C/hr (50 to 68°F/hr) down to approx. 600°C (1112°F), further cooling in air.
Hardness after annealing: max. 235 HB.

Stress relieving
600 to 650°C (1112 to 1202°F)
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.

Tempering
Slow heating to tempering temperature immediately after hardening / time in furnace
1 hour for each 20 mm of work piece thickness, but at least 2 hours / cooling in air.
It is recommended to temper at least twice.
A third tempering cycle for the purpose of stress relieving may be advantageous.
1st tempering approx. 30°C (86°F) above maximum secondary hardness.
2nd tempering to desired working hardness.
The tempering chart shows average tempered hardness values.
3rd for stress relieving at a temperature 30 - 50°C (86 to 122°F) be low highest tempering temperature.

Hardening
1000 to 1040°C (1832 to 1904°F)
Oil, salt bath (500 - 550°C / 932-1022°F), air
Holding time after temperature equalization: 15 to 30 minutes.
Obtainable hardness:
52 - 56 HRC in oil or salt bath,
50 - 54 HRC in air.

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.