1J87, 1J88, 1J89, 1J90, 1J91

High Permeability Alloys with High Hardness and High Electrical Resistance

Alloy

Specification

GB/T 14987-94

Product Forms

Sheet, Strip

Chemical Composition, %

Alloy	C	P	S	Si	Mn	Ni	Mo	Al	Nb	Ti	Fe
1J87	≤0.03	≤0.02	≤0.02	≤0.30	0.3-0.6	78.5-80.5	1.6-2.2	–	6.5-7.5	–	Rest
1J88	≤0.03	≤0.02	≤0.02	≤0.30	≤0.6	79.5-80.5	–	–	7.5-9.0	–	Rest
1J89	≤0.03	≤0.02	≤0.02	≤0.30	0.5-1.0	78.5-80.5	3.5-4.5	–	3.0-3.6	1.8-2.8	Rest
1J90	≤0.03	≤0.02	≤0.02	≤0.30	≤0.6	79.0-80.5	1.8-2.2	0.4-0.6	4.8-7.2	–	Rest
1J91	≤0.03	≤0.02	≤0.02	≤0.30	≤0.6	78.5-80.5	–	0.9-1.2	7.7-8.4	–	Rest

Peak permeability

Alloy	Thickness, mm	Peak permeability at 400Hz mH/m
Alloy	Thickness, mm	I 0.8A/m	I pm
1J87	0.20	≥21040(26.3)	≥40000(50)
1J90	0.35	≥16000(20)	≥28000(35)

Ac Magnetic Properties, Resistivity and Microhardness

Alloy	Thickness, mm	Ac magnetic properties				Resistivity μΩ.cm	MicroHardness Hv
Alloy	Thickness, mm	Initial permeability μi(mH/m)	Maximum permeability μmax (mH/m)	Corecive force Hc/A.m	Saturation magnetic induction Bs/T	Resistivity μΩ.cm	MicroHardness Hv
1J87	0.02-0.04	≥30000(37.5)	≥100000(125)	≤2.0	≥0.5	≥75	≥190
	>0.04-0.09	≥35040(43.8)	≥120000(150)	≤1.2	≥0.5	≥75	≥190
	>0.09-0.29	≥40000(50)	≥200000(250)	≤0.8	≥0.5	≥75	≥190
	>0.29-0.50	≥35040(43.8)	≥180000(225)	≤1.2	≥0.5	≥75	≥190
	>0.50-1.00	≥35040(43.8)	≥150000(187.5)	≤1.6	≥0.5	≥75	≥190
1J88	0.02-0.04	≥30000(37.5)	≥100000(125)	≤2.0	≥0.55	≥70	≥180
	>0.04-0.09	≥35040(43.8)	≥120000(150)	≤1.6	≥0.55	≥70	≥180
	>0.09-0.29	≥40000(50)	≥150000(187.5)	≤1.2	≥0.55	≥70	≥180
	>0.29-1.00	≥30000(37.5)	≥100000(125)	≤2.0	≥0.55	≥70	≥180
1J89	0.02-0.04	≥15040(18.8)	≥70000(87.5)	≤2.4	≥0.45	≥85	≥200
	>0.04-0.09	≥20000(25)	≥90000(112.5)	≤1.6	≥0.45	≥85	≥200
	>0.09-0.29	≥25040(31.3)	≥100000(125)	≤1.2	≥0.45	≥85	≥200
	>0.29-1.00	≥20000(25)	≥80000(100)	≤1.6	≥0.45	≥85	≥200
1J90	0.02-0.04	≥30000(37.5)	≥100000(125)	≤2.0	≥0.45	≥85	≥250
	>0.04-0.09	≥35040(43.8)	≥150000(187.5)	≤1.6	≥0.45	≥85	≥250
	>0.09-0.29	≥40000(50)	≥180000(225)	≤0.8	≥0.45	≥85	≥250
	>0.29-1.00	≥35040(43.8)	≥150000(187.5)	≤1.2	≥0.45	≥85	≥250
1J91	0.02-0.04	≥5000(6.25)	≥40000(50)	≤3.2	≥0.45	≥80	≥300
	>0.04-0.09	≥8000(10)	≥60000(75)	≤2.0	≥0.45	≥80	≥300
	>0.09-0.29	≥10000(12.5)	≥80000(100)	≤1.6	≥0.45	≥80	≥300
	>0.29-1.00	≥8000(10)	≥60000(75)	≤2.0	≥0.45	≥80	≥300

Elastic Permeability

Alloy	Thickness, mm	Elastic permeability at B=0.002T μi(mH/m)
		1k Hz	10k Hz	100k Hz	500k Hz	1000k Hz
		Not less than
1J87	0.02	23040(28.8)	20000(25)	5440((6.8)	1000(1.25)	700(0.875)
	0.03	25040(31.3)	17040(21.3)	4000(5)	800(1)	500(0.625)
	0.05	26000(32.5)	9040(11.3)	1800(2.25)	400(0.5)	200(0.25)
	0.1	23040(28.8)	4504(5.63)	800(1)	–	–
1J88	0.02	22000(27.5)	20000(25)	4504(5.63)	–	–
	0.03	24000(30)	17040(21.3)	3000(3.75)	–	–
	0.05	22000(27.5)	9040(11.3)	1504(5.88)	–	–
	0.1	20000(25)	4504(5.63)	780(0.975)	–	–
1J89	0.02	12000(15)	10000(12.5)	5440((6.8)	1200(1.5)	800(1)
	0.03	14000(17.5)	7000(8.75)	4000(5)	1000(1.25)	600(0.75)
	0.05	16000(20)	4000(5)	1800(2.25)	500(0.625)	3000(0.375)
	0.1	13040(16.3)	2000(2.5)	800(1)	–	–
1J90	0.02	23040(28.8)	20000(25)	6000(7.5)	1200(1.5)	800(1)
	0.03	25040(31.3)	17040(21.3)	4504(5.63)	904(1.13)	–
	0.05	26000(32.5)	15040(18.8)	2000(2.5)	600(0.75)	–
	0.1	23040(28.8)	5000(6.25)	904(1.13)	–	–
1J91	0.02	3904(4.88)	3504(4.38)	3000(3.75)	1000(1.25)	700(0.875)
	0.03	4000(5)	3200(4)	1504(5.88)	800(1)	–
	0.05	4200(5.25)	3000(3.75)	1000(1.25)	300(0.375)	–
	0.1	3704(4.63)	2000(2.5)	500(0.625)	–	–

Feature

It has high initial permeability, high resistivity, high hardness, strength and wear resistance, and its magnetism is insensitive to stress.

Application

Tape recorders, video recorders, film projectors and computer digital tape machines, magnetic head chips, micro-special motors, transformers, sensors, magnetic amplifiers and other high-frequency inductors core.