0&e Specification Document No.
Issue No. $lJ
B4E4
GeneralElecfric Company
Orders and Correspondence Must
Specify Complete Material Number
Strip, Regular Spring Steel
EMPIS Material B4E4 identifies cold-rolled regular spring steel strip, similar to UNS G10750, as follows:
EMPIS desianation Descriotion
B4E4Al Soft annealed temper, No. 2 regular bright finish, No. 3 slit edge
B4E4A2 Soft annealed temper, No. 2 regular bright finish, No. 5 square filed edge
B4E4A3 Soft annealed temper, No. 2 regular bright finish, No. 1 square edge
B4E4B2 Spring temper, scaleless blue or black finish, No. 1 square edge
B4E484 Spring temper, scaleless blue or black finish, No. 1 round edge
B4E4B6 Spring temper, scaleless blue or black finish, No. 3 slit edge
B4E4Cl Hard rolled, No. 2 regular bright finish, No. 3 slit edge
CHEMICAL COMPOSITION: % (Heat analysis)
Carbon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........ 0.70-0.80
Manganese . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.40-0.70
Phosphorus, max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.040
Sulfur, max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.050
MECHANICAL PROPERTIES:
Hardness:
Any greater Rockwell hardness ‘1) Vickers hardness,
EMPIS
thickness, diamond pyramid,
designation HRB HR45T HR30T HRl5T HRC HRA HR30N HRl5N
in 2.5 kgf load, HV
0.025 85max - - - - - - -
0.020 - 58 max - - - - - -
B4E4A1, A2, A3 0.015 - - 74 max - - - - -
0.010 - - - 88max - - - -
0.001 - - - - - - - - 142 max
0.034 - - - - 45-49 - - -
0.025 - - - - - 73-76 - -
B4E4B2,84, B6
0.018 - - - - - - 64-68 -
0.012 - - - - - - - 83-85
B4E4C1, HRC .. .. .. . . .. .. .. . . ... .. . .. .. . .. .. . ... . . ... . .. ... . .. .. .. . ... . .. .. .. . ... .. . .. .. . ... . .. ... . . ... . . ... . . ... .. . .. .. . ... .. . ... . 21-28
(1) If material does not meet the hardness test, the tension test shall be made as a basis for acceptance or rejection of
the material.
Tensile strength: (B4E482, 84, B6)
Thickness, in Tensile strength, psi
Over To incl Min Max
0.005 278,000 298,000
0.005 0.010 258,000 278,000
0.010 0.015 241,000 261,000
0.015 0.020 229,000 249,000
0.020 0.025 221 .ooo 241,000
0.025 I 0.030 I 214;OOO I 2341000
0.030 0.035 209.000 229.000
0.035 0.040 204;OOO 224;OO0
0.040 0.045 204,000 224,000
0.045 0.050 200,000 220,000
0.050 0.055 200.000 220.000
0.055 0.060 196;OOO 216:OOO
0.060 0.065 193,000 213,000
0.065 0.070 189,000 209,000
Tensile strength, psi (B4E4Cl) ... . . ... .. . .. .. . ... . .. ... . . ... .. . .. .. . ... . . ... . . ... . .. .. .. . .... . .. ... . . .... . . ... .. . ... . .. .. .. . ... 115,000-135,000
(Continued on page 2)
BS October 31,1999 + Supersedes: B4E4-S16 CAGE IDENT NO. 09172
B4E4S17
Page 2
Strip, RegularSpring Steel
ADDITIONAL REQUIREMENTS:
Material - Material furnished to B4E4A1, A2 and A3 shall be capable of being heat treated to the mechanical properties of
B4E4B2,84 and B6.
Imperfections -All material shall be free from pitting, rust and ripples. There shall be no objectionable surface imperfections
such as seams or deep scratches.
Edge - EMPIS Materials B4E4Al and B6 shall be furnished with a No. 3 approximately square edge produced by slitting only.
EMPIS Material B4E4A2 shall be furnished with a No. 5 edge produced by filing of a slit edge to remove burrs. EMPIS
Materials B4E4A3 and 82 shall be furnished with a No. 1 prepared smooth square edge. EMPIS Material B4E484 shall be
furnished with a No. 1 prepared smooth round edge.
Surface finish - EMPIS Material B4E4Cl shall have a surface finish no greater than 30 microinches.
REFEREE METHODS:
Chemical composition ~......................................................................................,.................... ASTM A751
Rockwell hardness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ASTM El8
Tension test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ASTM A370
Diamond pyramid hardness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ASTM E92
TOLERANCES:
Thickness: (Measured 3/8 inch or more in from the edge on 1 inch and wider, and on narrower than 1 inch at any place
between the edges).
Specified thickness,
Tolerance, plus or minus, inch
inch
Over l/2 inch to less 12 inches to less 18 inches to
Over To incl
than 12 inches wide than 18 inches wide 23 15116 inches wide
0.160 0.250 0.0025 0.0032 0.0036
0.125 0.1599 0.0022 0.0028 0.0032
0.070 0.1249 0.0018 0.0022 0.0028
0.040 0.0699 0.0014 0.0018 0.0024
0.030 0.0399 0.0012 0.0015 0.0020
0.020 0.0299 0.0010 0.0013 0.0015
0.015 0.0199 0.0008 0.0010 0.0012
0.010 0.0149 0.0005 0.0008 0.0010
Less than 0.010 0.0003 0.0006 0.0008
Width: (B4E4A1, B6 and Cl)
Specified width, inch Thickness, inch Tolerance for specified
Over I To incl Over 1 To incl width, plus or minus, inch
l/2 6 0.160 1 0.2499 0.016
I 6 I 12 1 0.160 1 0.2499 0.020
12 23 15/16 0.160 0.2499 0.031
l/2 6 0.099 0.160 0.010
6 12 0.099 0.160 0.016
12 23 15116 0.099 0.160 0.020
l/2 6 0.068 0.099 0.008
6 12 0.068 0.099 0.010
12 20 0.068 0.099 0.016
20 23 15116 0.068 0.099 0.020
l/2 9 0.016 0.068 0.005
9 12 0.016 0.068 0.010
12 20 0.016 0.068 0.016
20 23 15116 0.016 0.068 0.020
l/2 9 up to 0.016 incl 0.005
9 12 up to 0.016 incl 0.010
12 20 up to 0.016 incl 0.016
20 23 15116 up to 0.016 incl 0.020
EMPIS Specification BS October 31, 1999
B4E4S17
Page 3
Strip, RegularSpringSteel
TOLERANCES: (Continued)
Width: (B4E4A2)
Width, inch I Thickness, I Tolerance, I
Over I To incl I inch I plus or minus, inch
l/2 314 I Up to 0.0938 incl 0.005
I 5 314
9
I 59
20
I 0.125
Up to 0.125
to 0.008
inclincl
0.105 to 0.015 incl
I 0.010
0.005
0.010
20 23 15/16 0.080 to 0.023 incl 0.015
Width: (B4E4A3, B4E4B2, B4E4B4)
Width, inch Thickness, Width tolerance,
Over I To incl inch plus or minus, inch
l/2 7 Up to l/8 incl 0.005
Length: (All materials)
Width, inch Tolerance, plus only, inch
24 to 60 inches Over 60 to 120 inches Over 120 to 240
Over To incl
long incl long incl inches long incl
l/2 12 I/4 l/2 314
12 23 15116 l/2 314 1
Camber: (All materials) (2)
For material width over 112 to 1 l/2 inch incl:
l/2 inch in any 8 feet (3)
For material width over 1 l/2 to 23 15/16 inches incl:
l/4 inch in any 8 feet
(2) Camber is the deviation of a side edge from a straight line.
(3) The standard for measuring camber is based on any 8 feet of length. For strip less than 8 feet tolerances are to
be agreed upon between purchaser and supplier. Camber is obtained by placing an 8-foot straightedge on
the concave side and measuring the maximum distance between the strip edge and the straightedge.
CERTIFICATE OF TEST:
When requested, the supplier shall submit promptly to the purchaser at the point of delivery a certificate of test showing the
results of tests for chemical analysis and properties required by this specification. This certificate shall be addressed to
the section, unit, or person specified on the purchase order, and shall contain the EMPIS designation, the purchase order
number, and the quantity shipped so that the certificate may be identified with the shipment.
PACKING AND MARKING:
Material shall be properly separated by size for shipment and shall be packed in such a manner as to be suitably protected
from injury or loss during shipment. When lift size is not specified on the purchase order, standard ISS (formerly AISI) lift
will be acceptable.
Each shipment shall be legibly marked with the weight, purchase order number, the manufacturer’s name, and the EMPlS
designation.
EMPlS Specification BS October 31,1999
