Specification
Carbon and Alloy Steels
Page 3 of 8 Revision Date: 12/21/2015
3. COMPOSITION/INFORMATION ON INGREDIENTS
Components
CAS No.
% Weight
Exposure Limits
ACGIH TLV (mg/m
3
)
OSHA PEL (mg/m
3
)
Base Metal:
Iron
(Fe)
7439-89-6
Balance
5
Oxide Dust/Fume
10
Oxide Dust/Fume
Alloying
Elements
Aluminum
(Al)
7429-90-5
<0.05
10
5
Dust
Fume
15
5
Dust
Respirable fraction
Antimony
(Sb)
7440-36-0
<0.9
0.5
As Antimony
0.5
As Antimony
Arsenic
(As)
7440-38-2
<0.09
0.01
As Arsenic (A1 Carcinogen)
0.01
As Arsenic
Beryllium
(Be)
7440-41-7
<0.09
0.00
2
0.01
As Beryllium (A1 Carcinogen)
As Beryllium (STEL)
0.002
0.005
As Beryllium
As Beryllium (Ceiling)
Boron
(B)
7440-42-8
<0.9
10
Oxide Dust
15
Oxide Dust
Cadmium
(Cd)
7440-43-9
<0.01
0.01
0.00
2
As Cadmium (A2 Carcinogen)
Respirable fraction
0.005
0.0025
As Cadmium
As Cadmium (Action Level)
Calcium
(Ca)
1305-78-8
<0.9
2
Oxide Dust
5
Oxide Dust
Carbon
(C)
7440-44-0
<1.2
Not Established
Not Established
Chromium
(Cr)
7440-47-3
0.01-1.2
0.5
Metal
1
Metal
Cobalt
(Co)
7440-48-4
<0.09
0.02
As Cobalt (A3 Carcinogen)
0.1
Metal/Dust/Fume
Copper
(Cu)
7440-50-8
<0.9
1
0.2
Dust
Fume
1
0.1
Dust
Fume
Lead
(Pb)
7439-92-1
<0.07
0.05
Dust / Fume (A3 Carcinogen)
0.05
Dust / Fume
Magnesium
(Mg)
7439-95-4
<0.9
Not Established
Not Established
Manganese
(Mn)
7439-96-5
0.2-2
0.2
Elemental Mn and Inorg
Compounds
5
Fume (Ceiling)
Molybdenum
(Mo)
7439-98-7
<0.9
10
Insoluble Compounds
15
Insoluble Compounds
Niobium
(Nb)
7440-03-1
<0.9
Not Established
Nickel
(Ni)
7440-02-0
<1.0
1.5
Metal
1
Metal and Insoluble Compounds
Nitrogen
(N)
7727-37-9
<0.9
Simple Asphyxiant
Simple Asphyxiant
Phosphorus
(P)
7723-14-0
<0.9
0.1
Phosphorus
0.1
Phosphorus
Selenium
(Se)
7782-49-2
<0.9
0.2
Selenium
0.2
Selenium
Silicon
(Si)
7440-21-3
<0.9
10
Dust
15
Dust
Sulfur
(S)
7446-09-
05
<0.9
5.2
13
Sulfur Dioxide
Sulfur Dioxide (STEL)
13
Sulfur Dioxide
Tin
(Sn)
7440-31-5
<0.9
2
Metal,Oxide and Inorganic
Compounds
2
Inorganic Compounds
Titanium
(Ti)
7440-32-6
<0.9
Not Established
Not Established
Tungsten
(W)
7440-33-7
<0.9
5
10
Insoluble Compounds as W
Insoluble Compounds as W (STEL)
Not Established
Vanadium
(V)
7440-62-2
<0.9
0.05
Oxide Dust/Fume
0.5
0.1
Oxide Dust (Ceiling)
Oxide Fume (Ceiling)
Zinc
(Zn)
7440-66-6
0.0-0.10
10
5
10
Oxide Dust
OxideFume
Oxide Fume (STEL)
5
10
Oxide Fume
Oxide Dust
NOTE: No permissible exposure limits (PEL) or threshold limit values (TLV) exist for steel over all. The above listing is a summary of
elements used in alloying Nucor Steel Products. Various grades of steel will contain different combinations of these elements and/or
trace materials. Exact specifications may be found by calling the division and asking for a specifications sheet.