8620 Alloy Steel(supplied with round,square,flat,block)

AISI/SAE 8620 Alloy Steel Introduce

Lion Metal is one of the best AISI 8620 steel Manufacturers and Exporters, supplied with round,square,flat,block,and shaft etc.

AISI 8620 is defined as low carbon alloy steel which has 0.5% Cr, 0.2% Mo and 0.5% Ni as strengthening alloy elements.It is generally supplied as annealed condition with hardness HB255max.

AISI 8620 has good wear resistant with case hardness HRC 60-63 when carburized, hardened and tempered.

Compared with grades 8615 and 8617, it shows good core strength and toughness properties with a typical tensile strength range of 700-1100 MPa,in small to medium sized sections.

AISI 8620 is suited for applications which require a combination of toughness and wear resistance. it is commonly used in the engineering and automitive industries for toolholders and other such components.
Typical application:Arbors, pinions, bushes, camshafts, kingpins,ratchets, gears, splined shafts etc.

SUPPLY FORM & SIZE & TOLERANCE

Formulir Pasokan	Size(mm)	Proses	Toleransi
Bulat	6-Φ100	Ditarik Dingin	Cerah/Hitam	H11 terbaik
	16-Φ350	digulung panas	Hitam	-0/+1mm
	16-Φ350	digulung panas	Kupas/tanah	H11 terbaik
	90-Φ1000	Ditempa Panas	Hitam	-0/+5mm
	90-Φ1000	Ditempa Panas	Berbalik Kasar	-0/+3mm
Datar/Persegi/Blok	Thickness :120-800	Ditempa Panas	Hitam	-0/+8mm
Datar/Persegi/Blok	Width:120-1500	Ditempa Panas	Mesin Kasar	-0/+3mm

Remark:Tolerance can be customized as per requests

BAHAN KIMIA KOMPOSISI PER ASTM A29

NILAI	C	Dan	M N	P	S	Cr	Mo	Ni
8620	0.18-0.23	0.15-0.35	0.70-0.90	≤ 0.035	≤ 0.040	0.40-0.60	0.15-0.25	0.40-0.70

SIFAT FISIK

Kepadatan g/cm3	7.85
Titik lebur Deg F	2600
rasio Poisson	0.27-0.30
Machinability (AISI 1212 as 100% machinability)	65%
Thermal expansion (20 ºC)(ºC ˉ ¹)	12.2*10^-6
Specific heat capacity J/(kg*K)	477
Thermal conductivity W/(m*K)	46.6
Resistivitas listrik Ohm*m	2.34*10^-7

PROPERTI MEKANIK

Typical Mechanical Properties For Core – Carburised and Oil Quenched at 840 °C

Ukuran Bagian	11mm	30mm	63mm
Kekuatan Tarik Mpa	980-1270	780-1080	690-930
Kekuatan Hasil Mpa	785	590	490
Perpanjangan%	9	10	11
Charpy Impact J	41	⬅	⬅
Kekerasan HB	290-375	235-320	205-275
Kekerasan HRC	31-41	23-35	16-29

BATAS KEKERASAN

Jarak dari ujung yang dipadamkan mm	1.5	3	5	7	9	11	13	15	20	25	30	35	40
Min HRC	41	37	31	25	21	-	-	-	-	-	-	-	-
HRC Maks	48	47	43	39	35	32	30	29	26	24	23	⬅	⬅

Hardness values under 20HRC is not specified.

PENEMPAAN

Forging temperature should be carried out between 925℃-1230℃,AISI 8620 has low carbon content which is less susceptible to cracking than medium or high carbon steels,so it may be heated and cooled more rapidly.Soaking time at forging temperature should be as short as possible to avoid heavy scaling and excessive grain growth.The lower the forging-ending temperature ,the finer the grain size .Don’t forge below minimum forging temperature 850°C.This alloy should be cooled in sand.

NORMALISASI

Normalizing is used to refine the structure of forgings that might have cooled non-uniformly after forged,and considered as a conditioning treatment before case hardening.Normalizing temperature for AISI 8620 steel should be carried out between 900℃-925℃. hold suitable time for the steel to be thoroughly heated to complete the ferrite to austenite transformation.Cool in still air.This treatment is considered as another method of improving machinability.

PENYIMPANAN

Full annealing is recommended for AISI 8620 before machining, AISI 8620 should be carried our at a nominal temperature of 820℃-850℃,hold suitable time for the steel to be thoroughly heated, then furnace cooling.

PENGERTIAN KASUS

Following core refining, Heat the temperature to 780^HAIC – 820^HAIC, hold suitable time for the steel to be thoroughly heated, and quench in oil.Temper as soon as possible after quenched.

SEMANGAT

Tempering is usually carried out to relieve stresses from the hardening process,it will improve the toughness of both case and core, with only a little reduction in core strength and case hardness.Heat the AISI 8620 steel to 150^HAIC – 200^HAIC as required, hold enough time until temperature is uniform throughout the section, soak for 1 – 2 hours per 25 mm of section, and cool in still air.

KABURISASI

Pack, salt or gas carburize at temperature 900^HAIC – 925^HAIC, holding enough time to obtain the required case depth and carbon content, followed by a suitable hardening and tempering cycle to optimise case and core properties.