Machining and Decarburization Limits

Machining and Decarburization Limits

Minimum Allowances For Machining and Maximum Decarburization Limits (Hot Rolled Square and Flat Bars*)

machining

Ordered Thickness Inches Minimum Allowance Per Side for Machining Prior to Heat Treatment, Inch
Ordered Width. Inches
0 to ½ Incl. Over ½ to 1 incl. Over 1 to 2 incl. Over 2 to 3 incl. Over 3 to 4 incl. Over 4 to 5 incl. Over 5 to 6 incl. Over 6 to 7 incl. Over 7 to 8 incl. Over 8 to 9 incl. Over 9 to 10 incl.
0 to ½ incl. A .025 .025 .030 .035 .040 .045 .050 .055 .060 .060 .060
B .025 .036 .044 .056 .068 .092 .104 .120 .136 .144 .152
Over ½ to 1 incl. A .045 .045 .050 .055 .060 .070 .070 .075 .075 .075
B .045 .052 .064 .080 .104 .120 .136 .160 .160 .160
Over 1 to 2 incl. A .065 .065 .070 .070 .075 .075 .090 .095 .100
B .065 .075 .084 .112 .124 .144 .168 .180 .180
Over 2 to 3 incl. A .085 .085 .085 .085 .090 .100 .100 .100
B .085 .102 .120 .136 .160 .180 .190 .190
Over 3 to 4 incl. A .115 .115 .115 .115 .125 .125 .125
B .115 .127 .140 .180 .190 .190 .190
Over 4 to 5 incl. A .150 .150 .150 .150 .150 .150
B .150 .165 .180 .190 .190 .190
Over 5 to 6 incl. A .190 .190 .190 .190 .190
B .190 .190 .190 .190 .190
Over 6 A .250 .250 .250. .250
B .250 .250 .250 .250
MAXIMUM DECARBURIZATION LIMITS
80 Percent of above allowance per side

*These allowances also applicable to Cold Drawn Bars where cold drawn sizes are available.

Minimum Allowances For Machining and Maximum Decarburization Limits (Forged Square and Flat Bars)machining

Ordered Thickness Inches Minimum Allowance Per Side for Machining Prior to Heat Treatment. Inch
Ordered Width. Inches
0 to ½ incl. Over ½ to 1 incl. Over 1 to 2 incl. Over 2 to 3 incl. Over 3 to 4 incl. Over 4 to 5 incl. Over 5 to 6 incl. Over 6 to 7 incl. Over 7 to 8 incl. Over 8 to 9 incl. Over 9 to 10 incl.
0 to ½ incl. A .030 .030 .035 :040 I .045 .055 .065 .070 .075
B .030 .048 .064 .080 .100 .120 .144 .168 200
Over ½ to 1 incl. A .060 .060 .065 .065 .075 .080 .085 .090 .090 .110
B .060 .072 .084 .100 .120 .144 .168 .200 .200 200
Over I to 2 incl. A .090 .090 .090 .100 .110 .115 .125 .140 .150
B .090 .100 .108 .124 .148 .172 200 .200 .200
Over 2 to 3 incl. A .120 .120 .125 .130 .135 .150 .160 .175
B .120 .130 .140 .148 .172 .200 .200 .200
Over 3 to 4 incl. A .150 .150 .160 .180 .200 .210 .225
B .150 .150 .160 .180 200 .210 .225
Over 4 to 5 incl. A .180 .180 .190 210 .225 .250
B .180 .180 .190 .210 .225 .250
Over 5 to 6 incl. A .210 .225 .225 .250 .250
B .210 .225 .225 .250 .250
Over 6 A .250 .250 .250 .250
B .250 .250 .250 .250
MAXIMUM DECARBURIZATION LIMITS
80 Percent of above allowances per side
Data is typical and should not be construed as actual values for any category.
Applications and technical information require engineers and tool designers to exercise independent judgement.

Grade Color Codes

Diehl Steel Grade Color Codes

GradeColor
1018 Cold RollPink
4140 AnnealedYellow
4140 Heat TreatedOrange
4150 Heat TreatedOrange - Black
420Red - Yellow
6150Fluorescent Pink
8620Red - White - Blue
A-10Blue - Orange
A-2Blue
A-36 Hot Roll PlateBlack
A-36 XL PlateBlack
A-6Purple
A-8Blue - Black
CPM 10VBlue - Purple
CPM REX M-4Tan - Purple
D-2Green
D-7Green - Yellow
H-13Brown
H-13 PremiumBrown - Grey
L-6Red - White
M-2Tan
M-4Tan - White
M-42Tan - Black
O-1Red
O-6Red - Green
P-20Orange - Grey
P-20-32Jade - Violet
S-1White - Orange
S-5White - Yellow
S-7White
T-1Tan - Blue
T-15Tan - Yellow
VERTEXSilver
W-1Yellow - Purple

Charts – Steel Characteristics Comparison

Steel Characteristics Comparison Charts

With a variety of grades comes a variety of application usages. Below is a listing of our most commonly requested steel grades and a review of their physical characteristics.






Data is typical and should not be construed as actual values for any category.
Applications and technical information require engineers and tool designers to exercise independent judgement.

Diehl Tool Steel Abbreviations

Diehl Tool Steel Abbreviations

STEEL SURFACE CONDITIONS:

Abbreviation Meaning
CD FL COLD DRAWN FLAT ON-SIZE MATERIAL COLD DRAWN BAR STOCK
CD RD COLD DRAWN FLAT ON-SIZE MATERIAL COLD DRAWN BAR STOCK
CRS FL COLD ROLLED STEEL FLATS ON-SIZE BAR STOCK COLD FINISH
CRS RD COLD ROLLED STEEL ROUNDS ON-SIZE BAR STOCK COLD FINISH
DR DRILL ROD CENTERLESS GROUND ROUNDS +/- .001(SMALL SIZES +/-.0005) LENGTHS COME 36” STANDARD, 144” ALSO AVAILABLE METRIC DIAMETERS AVAILABLE  UP TO 25 MM
FG OS PRECISION GROUND GAGE STOCK- OVERSIZE TOLERANCES + .010 TO + .015 ON THICKNESS AND WIDTH SPINDLE GROUND FINISH
FG REG PRECISION GROUND GAGE STOCK- ON-SIZE TOLERANCES +/-.001 THICKNESS   + .005 -.000 WIDTH SPINDLE GROUND FINISH
HB HOLLOW BAR TURNED AND BORED HOLLOW ROUND STOCK USUALLY PROVIDED WITH ALLOWANCE TO FINISH TO CUSTOMER  SPECS
HG RD HARDENED GROUND ROUND TOL. UNDER 1/8” DIA (+.000 -.0005);  OVER 1/8”DIA ( +.000 -.001) MATERIAL HAS BEEN HEAT TREATED A-2   59-62 Rc M-2  63-66 Rc
HR BO FL HOT ROLL BURN OUT FLAT HOT ROLLED FINISH, NOT MACHINED.   BURNED BY FLAME CUTTING TO ANY SHAPE.
HR BO RD HOT ROLLED BURN OUT ROUND HOT ROLLED FINISH, NOT MACHINED BURNED BY FLAME CUTTING INTO A RING FROM PLATE.
HR FL HOT ROLL FLAT HOT ROLLED PLATE PRODUCT, CUT TO SIZE
HR RD HOT ROLL ROUND ROUND BARS  MANUFACTURED BY HOT ROLLING. FINISH IS NOT MACHINED APPROX. TOL.  +/- .010
PM BO FL PRE-MACHINED BURN-OUT FLAT MATERIAL IS BURNED FROM PLATE, THEN GROUND TOP AND BOTTOM TO CUSTOMER SPECS.
PM BO RD PRE-MACHINED BURN-OUT ROUND RINGS BURNED FROM PLATE, THEN GROUND TOP AND BOTTOM TO CUSTOMER SPECS.
PM FL PRE-MACHINED FLATS DECARB FREE MATERIAL, CUT FROM PLATE THICKNESS GROUND OVERSIZE +.015 TO +.035, SAW CUT +1/16 TO + 1/8” WIDTH AND LENGTH
RT RD ROUGH TURNED ROUND DECARB FREE ROUNDS, TURNED OVERSIZE +.015 TO +.030” LARGER DIAMETERS +1/16 TO +1/4”
SC FL SAW CUT FLATS RECTANGLES WHICH ARE COLD SAW CUT ON ALL DIMENSIONS FROM LARGER BLOCKS.  TOL. +1/16 TO + 1/8” ALL DIMENSIONS.
SG FL SPECIAL GROUND FLATS FLAT BAR STOCK GROUND TO CUSTOMER SPECS
SG RD SPECIAL GROUND ROUNDS ROUND BARS GROUND TO CUSOTMERS SPECIFICATIONS.
TGP RD TURNED, GROUND AND POLISHED ROUNDS TOL. +.000/-.002 TO -.004”

 

Steel Hardness Conditions

Abbreviation Meaning
ANLD ANNEALED FULLY ANNEALED MATERIAL USUALLY NO MORE THAN 17-22 Rc MAXIMUM HARDNESS
PHT PRE-HEAT TREATED OR PRE-HARD HEAT TREATED TO MID HARDNESS OF 27-35 Rc
SR STRESS RELIEVED HEAT TREATED TO TAKE OUT STRESSES WITHOUT FULLY ANNEALING.
POWDER POWDER METAL TOOL STEEL SPECIALIZED MELTING PROCESS FOR STEEL INGOTS THAT PRODUCES A SUPERIOR MICROSTRUCTURE. POWDER METAL TECHNOLOGY IS USED PRIMARILY IN THE VERY HIGHLY ALLOYED GRADES SUCH AS HIGH SPEED TOOL STEEL. SOLD IN ANNEALED CONDITION.
P-20 32 P-20 MATERIAL THAT HAS MINIMUM HARDNESS OF 32 Rc
P-20 36 P-20 MATERIAL THAT HAS A MINIMUM HARDNESS OF 36 Rc
P-20 HI-HARD P-20 MATERIAL HEAT TREATED TO 38-42 Rc
P-20 PHT P-20 MATERIAL HEAT TREATED TO 27-35 Rc
Data is typical and should not be construed as actual values for any category.
Applications and technical information require engineers and tool designers to exercise independent judgement.

Steel Physical Characteristics – Part 2

 Physical Characteristics of Specialty Steel – Part 2

Specialty Steel physical characteristics are determined by grade. Review this helpful table to determine which grade may be a candidate for your business needs.


Grade Fracture Grain Size Hardened Impact Strength Hardness Working Rockwell Hardness Quenched Rockwell Hardness Annealed Brinell Decarb Susceptability
A-10Low
A-28.558-6263-65202-248Low
A-6958-6261-63217-248Low
D-28.558-6263-65212-255Low
D-78.558-6565-67217-262Medium
H-137.545-5352-55202-235Low
M-29.564-66**63-65202-248Low
M-49.562-66**67-68212-255Medium
M-42966-6865-68229-269Medium
O-1958-6264-65179-212Low
O-6958-6263-64179-229Medium
S-17.553-5856-58179-229Low
S-5952-6060-62202-229Medium
S-7952-5860-62180-229Medium
T-19.563-6564-65202-248Low
T-159.566-6865-68241-277Medium
VERTEX58-6264-65212-248Low
W-158-6565-67156-202Low
Data is typical and should not be construed as actual values for any category.
Applications and technical information require engineers and tool designers to exercise independent judgement.