3Cr2W8V/H21/SKD5/L6 Mould Steel/Die Steel Steel Round Flat Bar

• Type: Alloy Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Technique: Hot Rolled
• Application: Tool Steel Bar, Die Steel Bar
• Surface Treatment: Polished
• Alloy: Alloy
• Model NO.: 3Cr2W8V/H21/SKD5/L6
• Special Use: Mold Steel, Hot Work Steel
• Products: Tool Steel Bar
• Grade: H21 SKD5 1.2581 3Cr2W8V
• Ut Standard: Sep 1921 C/C
• Transport Package: Sea Worthy
• Trademark: Laiwu Xincheng
• Origin: China
• Production Capacity: 3000tons/Month

Product Description

3Cr2W8V/H21/SKD5/L6 Mould steel/die steel steel round flat bar

H21 is perhaps the most widely used of the Tungsten hot work steels. The 9.5% tungsten content imparts good resistance to softening at service temperatures while still maintaining adequate toughness. Unlike the higher tungsten grades, H-21 may be cooled by continuous flow of water if the design of the die will permit.
We can supply the round bar, steel flat bar, plate, steel sheet, hexagonal steel bar and steel square block. AISI H21 steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces. H21 steel Rectangular pieces can be sawn from flat bar or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.


1.Supplied Size 
Steel Round Bar: diameter 8mm - 500mm
Steel Plate: thickness 2mm -300mm  x width 200mm - 800mm
Steel Slab: 200mm x  500-800mm
Surface Finish: Black, Rough Machined, Turned or as per given requirements.

2.Application of H21 steel 
H21 hot work tool steel is particularly useful for hot forging and blanking dies and punches for making nuts, bolts and other similar small components. Dies, cores, inserts, pins, etc for the die casting of copper base alloys are also prime applications for this steel. Other uses include forming dies, shear blades, hot extrusion dies, mandrels, punches, die holders, ejector discs and extrusion liners.

3.Material equivalent of H21 steel

USA	Germany	China	Japan	France	England	Italy	Sweden	Spain
AISI/UNS	DIN,WNr	GB	JIS	AFNOR	BS	UNI	SS	UNE
H21 / T20821	X30WCrV9-3 | 1.2581	3Cr2W8V	SKD5	X30WCrV9	BH21	X30WCRV93KU	2730	X30WCRV9

4.Chemical Composition of H21 Tool steel 

C	Si	Mn	P	S	Cr	W	V	Ni	Cu
0.26-0.36	0.15-0.50	0.15-0.40	0.030 max	0.030 max	3.00-3.75	8.50-10.00	0.30-0.60	0.30 max	0.25 max

  


5.Heat Treatment of H21 Steel 
Forging Of H21 steel-hot work alloy tool steel
Heat to 900-1100 °C(1652-2012°F),forged temperature not below 843°(1550°F)

Annealing of H21 Tool steel
Slowly heated to 800~850 ºC(1472~1562°F) and allow enough times, let the steel to be thoroughly heated, Then cool slowly at Maximum of 4°C(40°F)per hours. The H21 tool  steel will get MAX 235 HB (Brinell hardness).

Hardening of H21 tool steel
H21 steels should be heated uniformly to 1050-1100°C (1922-2012°F) until completely heated through. If needed, the steels can be preheated at 300-500°C (572-932°F). About 30 min/per 25 mm of ruling section is to be provided and then the steels should be immediately quenched in air.

Tempering of H21 tool steel
Tempering of H21 steels is performed at 600-650°C (212-662°F), Soak well at the selected temperature and soak for at least one hour per 25mm of total thickness. Get Rockwell C hardness of 50 MAX..