DIN1.2581 / H21 Hot Work Tool Steel
DIN1.2581 / H21 Hot Work Tool Steel

DIN1.2581 / H21 Hot Work Tool Steel

Produce process: Hot rolled /Forged
Type:Round bar
Delivery condition: Annealed black surface/Turned bright surface/Q+T

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Products Description

H21 is a hot working die steel containing tungsten. The steel increases the Mo content by 2%, and properly adds the Mn content, which improves the high temperature mechanical properties of the steel and meets the needs of mass production of aluminum alloy die-casting molds. The steel has high thermal elasticity, high thermal stability, good wear resistance and technological properties, and the working temperature reaches 650 ℃.

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Heat treatment process

Tempering specification: quenching temperature 1050~1100 ℃, oil cooling, tempering temperature 660~680 ℃, hardness after treatment 49~52HRC

Tempering temperature 600~620 ℃, hardness after treatment 40~44HRC. Quenching temperature 800~850 ℃, hard 50HRC

Quenching temperature 1050~1100 ℃, oil cooling, tempering temperature 660~680 ℃, hardness after treatment 49~52HRC, tempering temperature 600~620 ℃, hardness after treatment 40~44HRC.

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H21 Typical application examples

① Die sheet products are applicable to forging press dies, concave and convex dies, die-casting dies, hot metal cutters and other industries.

② Aluminum alloy die-casting die for mass production.

Products parameters

H21 Steel Equivalent Grades

Standards	DIN	AISI	JIS	ГОСТ
X30WCrV93	1.2581	H21	SKD5	3X2B8

H21 Equivalents’ Chemical Composition

C	Si	Mn	P	S	Cr	W	V
0.25-0.35	0.15-0.30	0.20-0.40	≤0.030	≤0.030	2.50-2.80	8.00-9.00	0.30-0.40

H21 Mechanical properties

Applications :

H21 Tool steel is for hot mechanical working such as highly stressed small pressing dies and die inserts especially for die forging of accurate products from the difficult-workable steels and copper alloys, thorns and jaws for forging presses, forgings for swaging, tools for production of rivets, nuts and screws, small extrusion dies (matrices), thorns, pressing discs for extrusion of alloys of non-ferrous metals.

Heat Treatment:

Soft annealing	Temperature(°C)	Cooling	Hardness
Soft annealing	740 - 780	furnace	max. 241 HB

Forging	Temperature(°C)	Cooling
	850 - 1100	furnace

Hardening	Temperature(°C)	Cooling	Tempering
	1140 - 1160	oil or air	see tempering diagram

Surface conditions: scaled (hot working finish)/ground/rough machining/fine machining/based on the customer's requirement
Furnaces for metallurgical processing: electrode arc + LF/VD/VOD/ESR/Vacuum consumable electrode.
Ultrasonic inspection: 100% ultrasonic inspection for any inperfections or based on the customer's requirement

Product Picture

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Our factory

Steel Making

Ingot Production

Forged Bars

Machinary

Characteristics of H21 die steel:

The steel section can be hardened below 80mm. This is enough for the surface layer to require large top forging dies, hot pressing dies and flat forging machine dies with high hardness and high wear resistance. This kind of steel has high transformation temperature and good thermal fatigue resistance against cold and hot alternation. This kind of steel can be used to make punch and die with high stress under high temperature, but not subject to impact load, such as punch and die used on flat forging machine, insert, copper alloy extrusion die, die casting die, such as reverse extrusion die; It can also be used as a hot metal cutter under high temperature. Tungsten-containing hot-working die steel, which increases the content of Mo by 2%, and properly adds the content of Mn to improve the high temperature mechanical properties of the steel, and meets the needs of mass production of aluminum alloy die-casting molds. The steel has high thermal strength, high thermal stability, good wear resistance and technological properties, and the working temperature reaches 650 ℃

H21 steel, a tungsten containing hot work die steel, contains a lot of chromium and tungsten elements that are easy to form carbides, so it has high strength and hardness at high temperature, and its hardness reaches HB-300 at 650 ℃, but its toughness and plasticity are poor.

Packing & Delivery

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Packing & Delivery

Packing detail: Spray paint in Bundle or as per client demands. Port:Any Chinese Port

The inner size of container is below:

-- 20ft GP: 5.8m(length) x 2.13m(width) x 2.18m(high)

-- 40ft GP: 11.8m(length) x 2.13m(width) x 2.18m(high)
-- 40ft HG: 11.8m(length) x 2.13m(width) x 2.72m(high)

Our Service

1. Competitive price and quality from our own factory .
2. Best service with 24 hour`s reply .
3. Flexible payment with T/T,L/C , etc .
4. Smooth production ability(1000tons/month).
5. Quick delivery and standard exporting package.

Relevant Steel Specifications of AISI T4 High Speed Tool Steels

Country	USA	German	Japan
Standard	ASTM A600	DIN EN ISO 4957	JIS G4403
Grades	T4/T12004	S 18-1-2-5/1.3255	SKH3

AISI T4 Tool Steel and Equivalents’ Chemical Composition

ASTM A600	C		Mn		P	S	Si		Cr		V		W		Mo		Co
T4	0.70	0.80	0.10	0.40	0.03	0.03	0.20	0.40	3.75	4.50	0.80	1.20	17.50	19.00	0.40	1.00	4.25	5.75
DIN ISO 4957	C		Mn		P	S	Si		Cr		V		W		Mo		Co
S 18-1-2-5/1.3255	0.75	0.83	…	0.40	0.03	0.03	…	0.45	3.80	4.50	0.80	1.20	17.50	18.50	0.50	0.80	4.50	5.50
JIS G4403	C		Mn		P	S	Si		Cr		V		W		Mo		Co
SKH3	0.73	0.83	…	0.40	0.03	0.03	…	0.45	3.80	4.50	0.80	1.20	17.00	19.00	…	…	4.50	5.50

Mechanical Properties of T-4 Steel

Properties	Metric	Imperial
Modulus of elasticity	190-210 GPa	27557-30458 ksi
Poisson’s ratio	0.27-0.30	0.27-0.30

Thermal Properties of T4 Tool Steels

Properties	Metric	Imperial
Thermal expansion co-efficient	11.9 µm/m°C	6.6 µin/in°F

Forging of ASTM T4 Tool Steel Materials

Forging of T4 steel can be carried out from 850 to 1120°C (1775 to 2100°F).

Preheat T4 steel material uniformly and slowly to 860-880°C.

Increase the forging temperature up to 1050-1120°C.

T4 hss tool steel should be cooled very slowly after forging.

AISI/ASTM T4 Tool Steel Heat Treatment and Properties

Hardening:

Harden T4 high speed tool steel from a temperature of 1260-1290oC followed by oil, air quenching or warm bath at 550oC. Hardness after quenching is 63-66 HRC.

Annealing:

T4 steel should be annealed after hot working. Increase the temperature of T4 high speed steel to 860°C(Max220°C per hour). Hold at the temperature and then cool slowly with the furnace. The annealed hardness achieved should be below HB255.

Tempering:

Tempering temperature: 2x 560-580oC. Hardness after tempering is 64-65 HRC.

Suositut Tagit: din1.2581 / h21 hot work tool steel

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