เหล็กกล้าเครื่องมือ D2 เทียบกับ A2

D2 tool steel and A2 tool steel are often used in industrial production. This article compares the data of the two steels so that the user can choose in practice. So, let’s look at the following article about D2 vs. A2 tool steel!

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D2 and A2 tool steel equivalent grades

USA/ASTM	USA/UNS	Germany/DIN	Germany/W-Nr.	Japan/JIS	ISO	China/GB
ดีทู	T30402	X155CrMo12-1	1.2379	สก.ด.11	160CrMoV12	Cr12Mo1V1
เอ2	T30102	X100CrMoV5-1	1.2363	สกด12	100CrMoV5	Cr5Mo1V

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Comparison of D2 and A2 composition

Grade	C (%)	Cr (%)	Mo (%)	V (%)	Si (%)	Mn (%)	P (%)	S (%)
ดีทู	1.40 ~ 1.60	11.00 ~ 13.00	0.70 ~ 1.20	0.50 ~ 1.10	0.10 ~ 0.60	0.10 ~ 0.60	—	—
เอ2	0.95 – 1.05	4.80 – 5.50	0.90 – 1.40	0.15 – 0.35	0.10 – 0.50	0.40 – 1.00	≤0.030	≤0.030

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Manufacturing and service characteristics of D2 and A2

Grades	Resistance to Decarburization	Hardening Response	Amount of Distortion	Resistance to Cracking	Approximate Hardness (HRC)	Machinability	Toughness	Resistance to Softening	Resistance to Wear
ดีทู	Medium	Deep	Lowest	Highest	54-61	Low	Low	High	High to very high
เอ2	Medium	Deep	Lowest	Highest	57-62	Medium	Medium	High	High

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Relative Wear Resistance of D2 and A2

Grades	Hardness, HRC	Abrasion weight loss, g x 10	Relative weight loss	Wear resistance rating
ดีทู	62.3	9.1	6:1	8
เอ2	62.9	33	22:1	6

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Wear resistance and toughness for cold-work dies and punches for blanking

Grades	Wear resistance	Toughness
ดีทู	8	2
เอ2	6	5

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For cold extrusion

Applications	Grades	Wear resistance	Toughness	Working hardness, HRC
Punches	ดีทู	8	2	60-62
Punch shank or mandrel	เอ2	6	5	56-58
Die Insert	ดีทู	8	2	60-62
Die Base	เอ2	6	5	54-56
Die Anvil	ดีทู	8	2	58-60
	เอ2	6	5	58-60

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