ALTA 1.2581 Tool Steel Properties (X30WCrV9-3, H21)

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Hot work tool steel

ALTA 1.2581 Tool Steel Specification

Steel properties

ALTA 1.2581 steel is a kind of ~ 8% W (tungsten) hot work tool steel, due to its high W% composition, it have high hot hardness (red hardness) and strength even at a high temperature. Medium hardenability, and poor performance of toughness and plasticity.

Suitable for making hot stamping dies, upsetting dies, die-casting dies, etc require high hardness at high temperature/high stress, but not subject to much impact loads (working temperature up to ~ 650 – 700°C).

Applications

² Die-casting mold (mold core, insert, mold core, diverter cone, nitrided ejector pin)

² Copper alloy extrusion die

² Die casting mold

Chemical composition

Chemical Composition per %

	C	Si	Mn	P	S	Cr	W	V	Ni	Cu
Min.	0.25	0.15	0.15			2.50	8.50	0.30
Max.	0.35	0.40	0.45	0.020	0.010	3.20	9.50	0.50	0.25	0.25

Basic melting process :

IM/EAF + LF + VD + ESR (EFS-annealing)

Hardness :	Max 241 HB (annealed)
Reduction ratio :	5 : 1 minimum or required
Grain size :	≥ 6.0 per ASTM E112
Non-metallic inclusion :	≤ 1.0 (thick), ≤ 1.5 (thin) per ASTM E45 method A (more pure by ESR route)
Microstructure	SEP1614 or NADCA # 207
Ultrasonic Test	SEP1921, EN 10308, ASTM A388 or agreed methods
Macro-structure	As per ASTM E381
Straightness / flatness	≤ 1.5 mm / m (machined), ≤ 2.5 mm / m (black)
Tolerance	Per discussed
Size range (round bars)	Ø 12 - 500 mm
Size range (flats, plates)	8 - 400 mm in thickness max. 1000 mm in width

Heat treatment

Annealing	Temperature(°C)	Hardness
Annealing	740 - 780	max. 241 HB

Hot-forming	Temperature(°C)
	850 - 1100

Hardening and tempering	Quenching temperature(°C)	Quenching medium	Frequently-used tempering temperature(°C)
Hardening and tempering	1140 - 1160	Oil	590 - 610

Ac1	Accm	Ar1	Arcm	Ms
820	925	773	838	380

Elastic modulus : E ( N/mm2 )

Temperature °C	Room 20	100	200	300
E	22600	22200	21600	20800

Modulus of rigidity / Shear modulus of elasticity : G ( N/mm2 )

Temperature °C	Room 20	100	200	300
G	8600	8490	8260	7930

Ratio of elastic modulus to shear modulus :

Temperature °C	Room 20	100	200	300	Average ratio
E : G	2.6279	2.6148	2.6150	2.623	2.6202

Coefficient of thermal conductivity : λ W/(m·K)

Temperature °C	100	200	700	900
λ	20.09	22.19	24.28	23.03

Resistivity : ρ(Ω·m)

Temperature °C	Room 20	200	500	700	900
P x 10-6	0.50	0.60	0.80	1.00	1.19

Coefficient of linear expansion : α(mm/(mm·°C))

Temperature °C	20~400	20~500	20~600	20~700
Αx 10-6	12.00	12.60	12.90	13.60

SPecific heat [capacity] : Cp (J/Kg·K)

Temperature °C	20-100	20-200	20-300
Cp x 103	0.465	0.473	0.478

Poisson-ratio : μ

Temperature °C	Room 20	100	200	300
μ	0.31	0.31	0.31	0.31

Oxidation resistance : (test sample hardness 48.8-49.1 HRC), + g/m2

h	2	7	15	25	35	45	60	80	125	150
600 °C	2.4	4.2	8.1	11.6	14.1	16.6	20.2	22.7	30.2	34.6

h	2	5	15	25	35	45	55	65	80	100
700 °C	5.7	11.4	24.7	35.9	49.5	55.9	66.3	75.3	87.5	100.5

h	2	5	8	11	15	20	25	30	35	40	45	50
750 °C	8.5	15.1	24.8	33.6	44.3	56.0	67.5	77.6	88.3	99.1	109.5	121.1

h	2	4	6	8	10	12	14	16	18	20	22	24
800 °C	13.5	23.1	32.8	45.7	59.1	74.1	87.0	98.2	11.3	122.9	136.7	148.5

h	1	2	3	4	5	6	7	8	9	10
850 °C	17.3	31.4	47.2	67.3	86.5	100.4	113.0	135.4	151.5	167.3

h	1	2	3	4
1000 °C	100.3	226.7	401.2	563.5

Thermal stability (-HRC) (A=48.8-49.1 HRC, B=42.0-43.0 HRC, h=soaking time - hours)

(1) 620°C

h	0	2	4	6	8	11.5	14.5	17.5	21
A	49.4	47.0	46.0	45.2	44.7	42.8	42.7	41.1	39.5
B	43.5	42.8	41.6	41.6	41.0	39.5	39.4	38.1	37.6

(2) 640°C

h	0	2	4	6	8	11	14	17
A	49.3	45.1	42.2	40.0	39.6	38.0	36.7	34.3
B	44.6	42.3	39.7	38.5	38.3	36.5	35.2	34.0

(3) 660°C

h	0	1	2	3	5	7	9	12
A	47.5	44.1	40.8	39.6	37.0	34.7	33.0	32.0
B	42.8	41.1	37.9	37.0	35.5	33.3	32.5	30.7

(4) 680°C

h	0	0.5	1	1.5	2	3	4
A	48.3	45.0	41.5	39.0	36.3	34.3	34.1
B	41.9	40.1	37.9	35.9	34.6	32.3	31.5

(5) 700°C

h	0	0.5	1	1.5	2	3
A	49.1	40.2	36.6	33.7	32.7	30.9
B	42.8	36.6	35.0	32.6	31.8	30.3

Downloads

2024-06-12 Alta 1.2581 SPEC (011 - S6 - T2 ).pdf

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Product images

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Features

² High hot hardness (red hardness)

² High thermal fatigue resistance

² High hot strength

² Good resistance to heat cracking

² High polishability and machinability

² Poor toughness and plasticity

2024-06-12 Alta 1.2581 SPEC (011 - S6 - T2 ).pdf