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GEMET ST 21

IDENTIFICATION CLASSIFICATION
Gemet ST21, ECoCr-E AWS/SFA 5.13: ECoCr -E, EN 14700: ECo1, DIN8555: E20-UM-300 -CTZ

DESCRIPTION
Basic coated stick electrode for the hardfacing of unalloyed, low-alloyed and high-alloyed steels. The weld metal is heat resistant and shows a good resistance against corrosive media. In the case of friction and sliding wear the alloy has a low friction coefficient against steels. Service temperatures up to 800°C.

WELD METAL ANALYSIS (RANGE) %

C	Cr	Mo	Ni	Co	Mn	Si	Fe	W
0.15 min	24 min	4.5 min	2 min	Bal	1.5 max	2.0 max	5.0 max	0.5 max
0.4 max	29 max	6.5 max	4 max	Bal	1.5 max	2.0 max	5.0 max	0.5 max

MECHANICAL PROPERTIES (RANGE)

Hardness of Pure Weld Metal

33 HRC

TYPICAL APPLICATIONS

High heat resistant special alloy with good high temperature strength. The weld metal shows an excellent resistance against mechanical shock.
This electrode is normally used for the hardfacing of forging dies, punches and hot cutting tools. Hot Trimming dies, valves.
Suitable for the cladding of sealing surface of valves used in power plants and chemical industry.

REDRYING : 300 - 320ºC / 2 h of electrodes.

PACKING PARAMETERS

Size (mm)	Length (mm)	Welding Current	Packing / Packet (kg)	Packing / Box (kg)
Size (mm)	Length (mm)	(A) Polarity = (+) ~	Packing / Packet (kg)	Packing / Box (kg)
2.5	350	70 - 110	2	2 x 5 = 10
3.15 / 3.20	350	100 - 140	2	2 x 5 = 10
4	350	140 - 180	2	2 x 5 = 10
5	350	180 - 220	2	2 x 5 = 10