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USAFLAT, MMC - General Engineering Quality Steel
Rounds Bright Drawn
Hexagons Bright Drawn
Squares Bright Drawn
Rounds Hot Rolled
Flats Bright Drawn
 

General

Colour Blue
Bright Drawn BS 970: Part 3: 1991: 080A15
Hot Rolled BS 970: Part 1: 1983: 080A15

Chemical Compostition
C
Mn
Si
S
P
Percentage
0.13-0.18
0.70-0.90
0.10-0.40
0.050 max.
0.050 max.

Mild Steel Specifications in BS 970
Mild steel is a generic term applied to low carbon steels that do not contain any alloying elements and where the carbon content does not exceed 0.25%. This covers a wide range of specifications and forms of steel. For mechanical engineering applications mild steel is used for parts that are not subject to high stress. Depending on the analysis, section and form of supply the tensile strength generally falls in the broad range of 350/550 N/mm2. When supplied in the bright cold drawn condition higher figures are obtainable, especially on small diameters. In earlier editions of BS 970 up to 1970 the most popular specification for bright mild steel was En3B, a loose specification with an analysis of 0.25% carbon max and 1.00% maganese max. When the six digit system was introduced, En3B was omitted and replaced by steels with a tighter chemical analysis, the harmonization of European steel standards requiring revisions to BS 970 has led to further changes. For clarification, the following mild steels may safely be specified for general mechanical engineering use.
BS 970: Part 1: 1991 080A15*
BS 970: Part 3: 1991 080A15*
080M15*
070M20*
BS EN 10083-1: 1991 C22E 1.1151
C22R 1.1149
*Readily available from stock
For components subsequently to be case-hardened 080A15 or 080M15 are the most suitable specifications. For welding applications any of the above steels should prove satisfactory.


 

Rounds Bright Drawn / Turned Stock Size Range

Size (ins) 1/8 3/16 1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 13/16 7/8 15/16
1 1 1/16 1 1/8 1 3/16 1 1/4 1 5/16 1 3/8 1 7/16 1 1/2 1 5/8 1 3/4 1 7/8 2 2 1/8
2 1/4 2 3/8 2 1/2 2 5/8 2 3/4 2 7/8 3 3 1/8 3 1/4 3 3/8 3 1/2 3 5/8 3 3/4 4
4 1/4 4 1/2 4 3/4 5 5 1/4 5 1/2 5 3/4 6 6 1/4 6 1/2 6 3/4 7 7 1/2 8
8 1/2 9 9 1/2 10 10 1/2 11 12
Size (mm) 3 4 5 6 7 8 9 10 11 12 13 14 15 16
17 18 19 20 22 24 25 26 28 30 32 35 36 38
40 42 45 48 50 52 55 56 60 65 70 75 80 85
90 100 105 110 115 120 125 130 140 150 160 180 200

 

Hexagons Bright Drawn Stock Size Range

Size ( ins. A/F.) 0.445 0.562 0.687 0.750 0.812 0.820 0.875 0.920 0.937 1.000 1.100 1.125 1.200 1.250
1.300 1.500 1.670 1.860 1.875 2.000 2.220 2.410 3.150 3.550


 

Squares Bright Drawn Stock Size Range

Size (ins) 3/16 1/4 5/16 3/8 7/16 1/2 5/8 11/16 3/4 7/8 1 1 1/8 1 1/4 1 1/2
1 3/4 2 2 1/4 2 1/2 2 3/4 3 3 1/2 4 4 1/2 5 5 1/2 6
4 6 8 10 12 13 14 15 16 18 20 22 25 30
32 35 40 45 50 55 60 65 70 75 80 90 100


 

Rounds Hot Rolled Stock Size Range

Size (mm) 40 45 50 55 60 65 70 75 80 85 90 95 100 105
110 115 120 125 130 140 145 150 155 160 165 170 180 190
200 210 220 240 250 260 280 300


 

Flats Bright Drawn / Cold Rolled Stock Size Range

Size (ins.)
1/4 x 1/8 1 x 1/16 1 1/2 x 1/8 *2 1/4 x 1/8 3 x 3/4 5 x 1/4 8 x 1/4
3/8 x 1/16 1 x 3/32 1 1/2 x 3/16 2 1/4 x 3/16 3 x 7/8 5 x 5/16 8 x 5/16
3/8 x 1/8 1 x 1/8 1 1/2 x 1/4 2 1/4 x 1/4 3 x 1 5 x 3/8 8 x 3/8
3/8 x 3/16 1 x 3/16 1 1/2 x 5/16 2 1/4 x 3/8 3 x 1 1/4 5 x 1/2 8 x 1/2
3/8 x 1/4 1 x 1/4 1 1/2 x 3/8 2 1/4 x 1/2 3 x 1 1/2 5 x 5/8 8 x 5/8
  1 x 5/16 1 1/2 x 1/2 2 1/4 x 5/8 3 x 1 3/4 5 x 3/4 8 x 3/4
1/2 x 1/16 1 x 3/8 1 1/2 x 5/8 2 1/4 x 3/4 3 x 2 5 x 1 8 x 1
1/2 x 1/8 1 x 7/16 1 1/2 x 3/4 2 1/4 x 1 3 x 2 1/2 5 x 1 1/4 8 x 1 1/4
1/2 x 3/16 1 x 1/2 1 1/2 x 7/8 2 1/4 x 1 1/4   5 x 1 1/2 8 x 1 1/2
1/2 x 1/4 1 x 5/8 1 1/2 x 1 2 1/4 x 1 1/2 3 1/2 x 1/4 5 x 2 8 x 2
1/2 x 5/16 1 x 3/4 1 1/2 x 1 1/4   3 1/2 x 3/8 5 x 2 1/2  
1/2 x 3/8 1 x 7/8   *2 1/2 x 1/8 3 1/2 x 1/2 5 x 3 9 x 3/8
    1 3/4 x 1/8 2 1/2 x 3/16 3 1/2 x 5/8 5 x 3 1/2 9 x 1/2
5/8 x 1/16 1 1/8 x 1/8 1 3/4 x 3/16 2 1/2 x 1/4 3 1/2 x 3/4   9 x 3/4
5/8 x 1/8 1 1/8 x 3/16 1 3/4 x 1/4 2 1/2 x 5/16 3 1/2 x 1 *6 x 1/8  
5/8 x 3/16 1 1/8 x 5/16 1 3/4 x 5/16 2 1/2 x 3/8 3 1/2 x 2 *6 x 3/16 10 x 1/4
5/8 x 1/4 1 1/8 x 3/8 1 3/4 x 3/8 2 1/2 x 1/2   6 x 1/4 10 x 5/16
5/8 x 5/16 1 1/8 x 1/2 1 3/4 x 1/2 2 1/2 x 5/8 4 x 1/8 6 x 5/16 10 x 3/8
5/8 x 3/8 1 1/8 x 5/8 1 3/4 x 5/8 2 1/2 x 3/4 4 x 3/16 6 x 3/8 10 x 1/2
5/8 x 1/2 1 1/8 x 3/4 1 3/4 x 3/4 2 1/2 x 1 4 x 1/4 6 x 1/2 10 x 5/8
  1 1/8 x 1 1 3/4 x 1 2 1/2 x 1 1/4 4 x 5/16 6 x 5/8 10 x 3/4
3/4 x 1/16   1 3/4 x 1 1/4 2 1/2 x 1 1/2 4 x 3/8 6 x 3/4 10 x 1
3/4 x 3/32 1 1/4 x 1/8 1 3/4 x 1 1/2 2 1/2 x 1 3/4 4 x 1/2 6 x 1 10 x 1 1/4
3/4 x 1/8 1 1/4 x 3/16   2 1/2 x 2 4 x 5/8 6 x 1 1/4 10 x 1 1/2
3/4 x 3/16 1 1/4 x 1/4 2 x 1/8   4 x 3/4 6 x 1 1/2 10 x 2
3/4 x 1/4 1 1/4 x 5/16 2 x 3/16 2 3/4 x 1/4 4 x 7/8 6 x 1 3/4  
3/4 x 5/16 1 1/4 x 3/8 2 x 1/4 2 3/4 x 1/2 4 x 1 6 x 2 12 x 1/4
3/4 x 3/8 1 1/4 x 1/2 2 x 5/16 2 3/4 x 3/4 4 x 1 1/4 6 x 2 1/2 12 x 3/8
3/4 x 1/2 1 1/4 x 5/8 2 x 3/8 2 3/4 x 1 4 x 1 1/2 6 x 3 12 x 1/2
3/4 x 5/8 1 1/4 x 3/4 2 x 1/2 2 3/4 x 1 1/4 4 x 1 3/4 6x 4 12 x 5/8
  1 1/4 x 7/8 2 x 5/8 2 3/4 x 1 1/2 4 x 2   12 x 3/4
7/8 x 1/8 1 1/4 x 1 2 x 3/4   4 x 2 1/2 7 x 1/4 12 x 1
7/8 x 3/16   2 x 7/8 3 x 1/8 4 x 3 7 x 3/8 12 x 1 1/4
7/8 x 1/4 1 3/8 x 1/4 2 x 1 3 x 3/16   7 x 1/2 12 x 2
7/8 x 5/16 1 3/8 x 3/8 2 x 1 1/4 3 x 1/4 4 1/2 x 1/4 7 x 3/4  
7/8 x 3/8 1 3/8 x 1/2 2 x 1 1/2 3 x 5/16 4 1/2 x 3/8 7 x 1  
7/8 x 1/2 1 3/8 x 1 2 x 1 3/4 3 x 3/8 4 1/2 x 1/2    
7/8 x 5/8     3 x 1/2 4 1/2 x 5/8    
7/8 x 3/4     3 x 5/8 4 1/2 x 3/4    
        4 1/2 x 1    

Size (mm)
10 x 2 25 x 2 35 x 6 *50 x 3 65 x 6 80 x 3 110 x 10 150 x 10
10 x 3 25 x 3 35 x 8 50 x 5 65 x 10 80 x 6 110 x 12 150 x 12
10 x 5 25 x 4 35 x 10 50 x 6 65 x 12 80 x 10 110 x 16 150 x 16
10 x 6 25 x 5 35 x 16 50 x 8 65 x 16 80 x 12 110 x 20 150 x 20
  25 x 6 35 x 20 50 x 10 65 x 20 80 x 16 110 x 25 150 x 25
12 x 3 25 x 8 35 x 25 50 x 12 65 x 25 80 x 20 110 x 30 150 x 30
12 x 5 25 x 10 35 x 30 50 x 16 65 x 30 80 x 25 110 x 40  
12 x 6 25 x 12   50 x 20 65 x 40 80 x 30 110 x 50 160 x 6
12 x 10 25 x 16 40 x 3 50 x 25 65 x 50 80 x 40   160 x 10
  25 x 20 40 x 5 50 x 30   80 x 50 125 x 6 160 x 12
15 x 3   40 x 6 50 x 35 70 x 6   125 x 8 160 x 16
15 x 4 30 x 3 40 x 8 50 x 40 70 x 10 90 x 6 125 x 10 160 x 20
15 x 5 30 x 4 40 x 10   70 x 12 90 x 10 125 x 12 160 x 25
15 x 6 30 x 5 40 x 12 55 x 6 70 x 16 90 x 12 125 x 16 160 x 30
15 x 8 30 x 6 40 x 16 55 x 10 70 x 20 90 x 16 125 x 20 160 x 40
15 x 10 30 x 8 40 x 20 55 x 12 70 x 25 90 x 20 125 x 25 160 x 50
  30 x 10 40 x 25 55 x 16 70 x 30 90 x 25 125 x 30  
16 x 3 30 x 12 40 x 30 55 x 20 70 x 35 90 x 30 125 x 40 200 x 10
16 x 5 30 x 16   55 x 25 70 x 40 90 x 40 125 x 50 200 x 12
16 x 6 30 x 20 45 x 5 55 x 30 70 x 50 90 x 50   200 x 20
16 x 10 30 x 25 45 x 6 55 x 40     130 x 10 200 x 25
16 x 12   45 x 8   75 x 6 100 x 5 130 x 16  
  32 x 6 45 x 10 60 x 6 75 x 8 100 x 6 130 x 20  
20 x 1.5 32 x 10 45 x 12 60 x 8 75 x 10 100 x 10 130 x 25  
20 x 2 32 x 12 45 x 16 60 x 10 75 x 12 100 x 12    
20 x 3 32 x 16 45 x 20 60 x 12 75 x 16 100 x 16 140 x 6  
20 x 4 32 x 20 45 x 25 60 x 16 75 x 20 100 x 20 140 x 10  
20 x 5 32 x 25 45 x 30 60 x 20 75 x 25 100 x 25 140 x 12  
20 x 6   45 x 35 60 x 25 75 x 35 100 x 30    
20 x 8   45 x 40 60 x 30 75 x 40 100 x 40    
20 x 10     60 x 40   100 x 50    
20 x 12         100 x 65    
20 x 16              
 

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