ISO 4999:2005

INTERNATIONAL ISO
STANDARD 4999
Fourth edition
2005-11-01

Continuous hot-dip terne (lead alloy)
coated cold-reduced carbon steel sheet
of commercial, drawing and structural
qualities
Tôles en acier au carbone laminées à froid, revêtues d'un alliage au
plomb en continu par immersion à chaud, de qualités commerciale,
pour emboutissage et de construction




Reference number
ISO 4999:2005(E)
©
ISO 2005

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ISO 4999:2005(E)
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ISO 4999:2005(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Thickness . 2
5 Requirements . 3
5.1 Chemical composition. 3
5.2 Mechanical properties. 4
5.3 Coating. 6
5.4 Weldability . 6
5.5 Surface treatments . 7
5.6 Coated coil joining. 7
5.7 Dimensional and shape tolerances. 7
6 Sampling. 7
6.1 Chemical composition. 7
6.2 Tensile test . 7
6.3 Coating tests . 7
6.4 Coating adherence. 8
6.5 Retest . 8
7 Test methods. 8
7.1 Tensile test . 8
7.2 Coating properties. 8
8 Designation system. 8
8.1 Coating mass . 9
8.2 Coating surface condition . 9
8.3 Surface treatment . 9
8.4 The base metal designations. 9
8.5 Examples . 9
9 Resubmission . 10
10 Workmanship . 10
11 Inspection and acceptance. 10
12 Marking . 10
13 Information to be supplied by the purchaser . 11
Annex A (informative) Determination of mass and composition of coating on terne (lead alloy)
coated sheet . 12
Annex B (informative) Orders requiring base metal thickness . 18
Bibliography . 19

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ISO 4999:2005(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 4999 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat
rolled products.
This fourth edition cancels and replaces the third edition (ISO 4999:1999), which has been technically revised.
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INTERNATIONAL STANDARD ISO 4999:2005(E)

Continuous hot-dip terne (lead alloy) coated cold-reduced
carbon steel sheet of commercial, drawing and structural
qualities
1 Scope
This International Standard applies to cold-reduced carbon steel sheet of commercial, drawing and structural
qualities coated by a continuous hot-dip terne (lead alloy) coating process. It includes the group of products
commonly known as terne plate or terne sheets (or in the U.S.A. as terne coated).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the reference document
(including any amendments) applies.
ISO 6892:1998, Metallic materials — Tensile testing at ambient temperature
ISO 7438:1985, Metallic materials — Bend test
ISO 16162, Continuously cold-rolled steel sheet products — Dimensional and shape tolerances
ISO 16163, Continuously hot-dipped coated steel sheet products — Dimensional and shape tolerances
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Quality applications
3.1.1
commercial
intended for general fabricating purposes where sheet is used in the flat condition, or for bending or moderate
forming
3.1.2
drawing
intended for parts where drawing or severe forming may be involved
3.1.3
deep drawing
intended for parts where severe forming or severe drawing may be involved
3.1.4
drawing-aluminum killed (non-aging)
intended for fabricating parts where particularly severe drawing or forming may be involved or essential
freedom from aging is required
3.1.5
extra deep drawing (stabilized)
intended for applications requiring interstitial free steel (IF) which is non-aging and has maximum formability
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ISO 4999:2005(E)
3.1.6
structural quality
structural quality which is available in several grades and classes
See Table 5.
3.2
aluminum killed
steel which has been deoxidized with aluminum that is sufficient to prevent the evolution of gas during
solidification
3.3
stabilized interstitial free steel
extra low carbon steel in which all interstitial elements are combined with titanium and/or equivalent elements
NOTE Stabilized steel is sometimes referred to as interstitial free steel.
3.4
terne
lead alloy
any lead-based alloy in commercial use for the hot-dip coating of steel sheet
NOTE 1 Tin is the most common alloying element, but antimony is also commercially used, as are combinations of
both elements
NOTE 2 If a specific alloy composition is required, it shall be by agreement between the manufacturer and purchaser.
3.5
skin pass
light cold rolling of the coated steel sheet
NOTE The purpose of the skin pass is to produce a higher degree of surface smoothness and thereby improve the
surface appearance. The skin pass also temporarily minimizes the occurrence of a surface condition known as stretcher
strain (Luder’s Lines) or fluting during the fabrication of finished parts. The skin pass also controls and improves flatness.
Some increase in hardness and some loss in ductility will result from skin passing.
3.6
differential coating
coating having a coating mass on one surface significantly different from the coating mass on the other
surface
4 Thickness
Terne sheet is normally produced in thicknesses from 0,30 mm to 2,0 mm, and in widths of 600 mm to
1 400 mm in coils and cut lengths. Terne sheet less than 600 mm wide may be slit from wide sheet and will be
considered as sheet. Slit sheet is not available from all producers. Terne sheets are used where ease of
solderability, a degree of corrosion resistance, or amenability to stamping, pressing or deep-drawing will be
advantageous.
The thickness of hot-dip terne (lead alloy) coated steel sheet may be specified as a combination of the base
metal and metallic coating, or as base metal alone. The purchaser shall indicate on the order which method of
specifying is required. In the event that the purchaser does not indicate any preference, the thickness as a
combination of the base metal and coating will be provided. Annex B describes the requirements for
specifying the thickness as base metal alone.
a) Terne (lead alloy) coated steel sheet may be ordered in one of two ordering conditions:
⎯ Ordering condition A): Steel ordered to satisfy mechanical property requirements.
⎯ Ordering condition B): Steel ordered to make an identified application.
b) Terne (lead alloy) coated steel sheet is available in several fabrication qualities.
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ISO 4999:2005(E)
5 Requirements
5.1 Chemical composition
The chemical composition (heat analysis) shall not exceed the values given in Tables 1, 2 and 3.
A verification analysis may be made by the purchaser to verify the specified analysis of the product and shall
take into consideration any normal heterogeneity. Non-killed steels (such as rimmed or capped steels) are not
technologically suited to product analysis. For killed steels, the sampling method and deviation limits shall be
agreed upon between the interested parties at the time of ordering. The product analysis tolerances are
shown in Table 4.
The processes used in making the steel and in manufacturing terne (lead alloy) sheet are left to the discretion
of the manufacturer. When requested, the purchaser shall be informed of the steel-making process used. On
request, a report of the heat analysis shall be made to the purchaser.
Table 1 — Chemical composition (heat analysis) commercial and drawing qualities
Mass fractions in percent
C Mn P S Ti
Quality
max. max. max. max. max.
Designation Name
T0 01 Commercial 0,15 0,60 0,035 0,04 —
T0 02 Drawing 0,10 0,50 0,025 0,035 —

a
T0 03 Deep drawing 0,10 0,45 0,03 0,03

a
T0 04 Drawing aluminum killed 0,10 0,50 0,025 0,035

a
T0 05 Extra deep drawing stabilized 0,02 0,25 0,02 0,02 0,30
a
For interstitial free steels only, the value of 0,15 % titanium, and 0,10 % maximum for niobium and vanadium, are acceptable to
ensure that the carbon and nitrogen are fully stabilized.

Table 2 — Chemical composition (heat analysis) structural quality
Mass fractions in percent
C Mn P S
Method of
Grade Class
deoxidation
max. max. max. max.
B E or NE 0,15 Not applicable 0,035 0,035
TCR220
D CS 0,15 Not applicable 0,035 0,035
B E or NE 0,20 Not applicable 0,035 0,035
TCR250
D CS 0,20 Not applicable 0,035 0,035
B E or NE 0,20 1,50 0,035 0,035
TCR320
D CS 0,20 1,50 0,035 0,035
TCH550 Not applicable Not applicable 0,20 1,50 0,035 0,035
NOTE 1 E = Rimming
NE = Non-rimming
CS = Aluminum killed.
NOTE 2 The mass fraction of nitrogen is controlled; normally not exceeding 0,009 % for E or NE steel or 0,015 % for CS steel.
NOTE 3 Class B steels are intended for use in welded structures or structural parts, subjected to normal loading conditions.
NOTE 4 Class D steels are to be used for structures or structural parts where, owing to loading conditions and the general design
of the structure, a high resistance to brittle fracture is necessary.
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ISO 4999:2005(E)
a
Table 3 — Limits on additional chemical elements
Heat analysis Product analysis
Elements
max. % max. %
b
Cu 0,20 0,23
b
Ni 0,20 0,23
b, c
Cr 0,15 0,19
b, c
Mo 0,06 0,07
e
Nb 0,008 0,018
d, e
V 0,008 0,018
e
Ti 0,008 0,018
a
Each of the elements listed in this table shall be included in the report of the heat analysis. When the amount of copper, nickel,
chromium or molybdenum present is less than 0,02 %, the analysis may be reported as “< 0,02 %”.

b
The sum of copper, nickel, chromium, and molybdenum shall not exceed 0,50 % on heat analysis. When one or more of these
elements are specified, the sum does not apply; in which case, only the individual limits on the remaining elements will apply.

c
The sum of chromium and molybdenum shall not exceed 0,16 % on heat analysis. When one or more of these elements are
specified, the sum does not apply; in which case, only the individual limits on the remaining elements will apply.
d
Analysis greater than 0,008 may be supplied after agreement between the producer and consumer.

e
For interstitial free steels only, the value of 0,15 % titanium, and 0,10 % maximum for niobium and vanadium, are acceptable to
ensure that the carbon and nitrogen are fully stabilized.

Table 4 — Product analysis tolerances
Mass fractions in percent
Maximum of Tolerance over
Element
specified element maximum specified
C 0,25 0,04
Mn 1,70 0,14
P 0,05 0,01
S 0,035 0,01
NOTE The above maximum tolerance is the allowable excess over the specified requirement and not the heat analysis.

5.2 Mechanical properties
5.2.1 Commercial and drawing qualities
Terne (lead alloy) coated sheet of designations T0 02, T0 03, T0 04 and T0 05 are supplied under the
following two ordering conditions.
a) Ordering condition A): Steel when ordered according to its mechanical properties, at the time the steel is
made available for shipment, shall satisfy the applicable requirements of Table 5.
b) Ordering condition B): Steel when ordered to make an identified part shall be supplied with a commitment
for satisfactory manufacturing performance within a properly established breakage allowance, which shall
be previously agreed upon between the interested parties. In these cases, the part name, the details of
fabrication, and special requirements (such as freedom from stretcher strain or fluting) shall be specified.
Prolonged storage of the sheet can cause a change in mechanical properties (increase in hardness and
decrease in elongation), leading to a decrease in drawability. To minimize this effect, qualities T0 04 or T0 05
should be specified.
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ISO 4999:2005(E)
Table 5 — Mechanical properties other than structural quality
a b
Quality R max. A min.
m
2
Designation Name N/mm L = 50 mm L = 80 mm
o o
T0 01 Commercial
T0 02 Drawing 430 24 23
T0 03 Deep drawing 410 26 25
Deep drawing
T0 04 410 29 28
aluminum killed
Extra deep drawing
T0 05 350 37 36
stabilized
R = tensile strength
m
A = percentage elongation after fracture
L = gauge length on test piece
o
2
1 N/mm = 1 MPa
a 2
The minimum tensile strength for qualities T0 02, T0 03, T0 04 and T0 05 would normally be expected to be 270 N/mm . All tensile
2
strength values are determined to the nearest 10 N/mm .
b
For material up to an including 0,6 mm in thickness, the elongation values in this table shall be reduced by 2. For thicknesses up to
2 mm, use either L = 50 mm or L = 80 mm.
o o

5.2.2 Structural quality
The mechanical properties, at the time the steel is made available for shipment, shall satisfy the requirements
of Table 6.
Table 6 — Mechanical properties, structural quality
Coating bend test
a
R min. R min. A min, %
e m
180° bend-mandrel diameter
Grade
2 2
N/mm N/mm L = 50 mm L = 80 mm e < 3 mm e W 3 mm
o o
TCR220 220 300 22 20 1a 2a
TCR250 250 330 20 18 1a 2a
TCR320 320 400 16 14 3a 3a
b
TCH550 550 — — — —

R = yield stress — can be either R or R but not both

e eL eH
R = lower yield stress

eL
R = higher yield stress

eH
R = tensile strength

m
A= percentage elongation after fracture

L = gauge length on test piece

o
a= thickness of bend test piece

2
1 N/mm = 1 MPa

R can be measured by 0,5 % total elongation proof stress (proof stress under load) or by 0,2 % offset when a definite
eL
yield phenomenon is not present.
a
Use either L = 50 mm or L = 80 mm.
o o
b
For grade TCH550, the yield point approaches the tensile strength and since there is no hesitation of the pointer or drop of the
beam, the lower yield stress (R ) shall be taken as the stress at 0,5 % total elongation under load in accordance with ISO 6892.
eL
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ISO 4999:2005(E)
5.3 Coating
5.3.1 Coating mass
The coating mass limits shall conform to the limits for the designations shown in Table 7. The coating mass is
the total amount of coating on both sides of the sheet, expressed in grams per square metre.
Table 7 — Coating designations and limits
2
Minimum coating mass limits, g/m
(total both sides)
Coating designation
Triple-spot test check limits Single-spot test check limits
001 No minimum No minimum
050 50 40
075 75 60
100 100 75
120 120 90
170 170 125
260 260 215
335 335 275
NOTE 1 The coating mass, in grams per square metre, refers to the total coating on both surfaces. Because of the many variables

and changing conditions that are characteristic of continuous hot-dip coating, the coating mass is not always evenly divided between the
two surfaces of a sheet, neither is the coating evenly distributed from edge to edge. However, it can normally be expected that no less
than 40 % of the single-spot test limit will be found on either surface.
NOTE 2 “No minimum” means that there are no established minimum check limits for triple-spot and single-spot tests.

2
NOTE 3 The coating thickness may be estimated from the coating mass by using the following relationship: 100 g/m total both
sides ≅ 0,006 8 mm total both sides.

5.3.2 Coating adherence
The coated sheet shall be capable of being bent in any direction, in accordance with the mandrel
requirements of Table 8 for commercial and drawing qualities and Table 6 for structural quality, without flaking
of the coating on the outside of the bend. Flaking of the coating within 7 mm from the edge shall not be cause
for rejection.
Table 8 — Coating bend test requirements, excluding structural quality
180° bend-mandrel diameter, for all thicknesses and all coating designations
Commercial quality Drawing qualities
0
1a
(flat on itself)
a = thickness of bend test piece.

5.4 Weldability
Terne sheet is suitable for welding, soldering or brazing if appropriate methods and procedures are selected
with special attention to the heavier coatings. When the mass fraction of carbon increases above 0,15 %, spot
welding becomes increasingly difficult. Because the heat of welding might have a significant effect on lowering
the strength of grade 550, this grade is not recommended for welding.
WARNING — When sheet is subjected to joining techniques involving heat, suitable precautions must
be taken to avoid toxic effects.
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ISO 4999:2005(E)
5.5 Surface treatments
5.5.1 Mill passivation
A chemical treatment may be applied to minimize the hazard of wet storage stain during shipment and storage.
However, the inhibiting characteristics of the treatment are limited and if a shipment is received wet, the
material shall be used immediately.
5.5.2 Oiling
Oiling prevents marring and scratching of the soft surface during handling or shipping and helps to minimize
the hazard of storage stain. The order should specify whether the sheet should be oiled or non-oiled.
5.6 Coated coil joining
Continuous hot-dip coating lines may use various methods to join coil ends. The shipment of coils containing
the joined ends may be permitted, if agreed upon between the manufacturer and purchaser.
5.7 Dimensional and shape tolerances
Dimensional and shape tolerances applicable to the coated steel sheet shall be as given in ISO 16163. The
tolerances for thickness apply to products whose thickness is a combination of base metal and coating.
When the base metal thickness is specified, the thickness tolerances of ISO 16163 shall apply to the average
product thickness calculated in accordance with Annex B. The tolerances for thickness of the base metal shall
be as given in ISO 16162.
6 Sampling
6.1 Chemical composition
The heat analysis of each steel shall be made by the manufacturer to determine compliance with the
requirements of Tables 1, 2 and 3.
6.2 Tensile test
When required, one representative transverse test shall be taken from each lot for shipment to verify
compliance with the requirements of Tables 5 and 6. Transverse test pieces shall be taken midway between
the center and the edge of the sheet as-rolled. A lot consists of 50 tonnes or less of sheet of the same grade
rolled to the same thickness and condition.
6.3 Coating tests
6.3.1 Coating mass
The producer shall develop a testing plan with a frequency sufficient to adequately characterize the lot of
material and ensure conformance with specification requirements.
The purchaser may conduct verification tests by securing a sample piece approximately 300 mm in length by
the as-coated width from which three test specimens will be taken, one from the mid-width position and one
from each side, not closer than 25 mm from the side edge. The minimum area of the three specimens shall be
2
2 000 mm .
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ISO 4999:2005(E)
6.3.2 Triple-spot test
The triple-spot test result shall be the average coating mass found on three specimens taken in accordance to
5.3.1.
6.3.3 Single-spot test
The single-spot test result shall be the minimum coating mass found on any one of the three specimens used
for the triple-spot test. Material, which has been slit from wide coil, shall be subject to a single-spot test only.
6.4 Coating adherence
One representative sample for the coating-adherence bend test shall be taken from each lot of sheet for
shipment. The specimens for the coating-adherence bend test shall be taken not closer than 25 mm from the
side edge. The minimum width of the test specimen shall be 50 mm.
6.5 Retest
If a test does not satisfy the specified results, two more test pieces shall be taken at random from the same lot.
Both retests shall conform to the requirements of this International Standard, otherwise the lot shall be
rejected.
7 Test methods
7.1 Tensile test
The tests shall be conducted in accordance with the methods specified in ISO 6892. Transverse test pieces
shall be taken midway between the center and edge of the sheet as-rolled. Base metal thickness shall be
used to calculate the cross-sectional area needed for the tensile test; however, for orders specifying thickness
“as base metal only” there are two permissible methods for determining the base metal thickness.
a) Option A — Determine the actual base metal thickness through direct measurement of the substrate of a
specimen whose coating has been removed.
b) Option B — Calculation of the base metal thickness through subtraction of the average coating thickness
for the appropriate coating designation included in Annex B from the actual coated thickness of the test
specimen.
7.2 Coating properties
7.2.1 Coating mass
The manufacturer shall conduct tests for coating mass using the methods described in Annex A.
7.2.2 Coating adherence
Bend tests shall be conducted in accordance with the methods specified in ISO 7438.
8 Designation system
The designation system includes the coating name, coating mass designation, coating surface condition,
surface treatment, base metal quality or grade of structural steel.
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ISO 4999:2005(E)
8.1 Coating mass
The letters T0 are used to indicate the terne (lead alloy) coating.
Coating mass designations are 001, 050, 075, 100, 120, 170, 260 and 335.
The coating is expressed as the total mass on both surfaces, in grams per square metre. The coating mass
specified should be compatible with the desired service life, the thickness of the base metal and with the
forming requirements involved.
NOTE For differential coatings, the standard would be top surface before bottom surface. An example of a differential
coating designation is: T0170S100C02
8.2 Coating surface condition
⎯ N normal — as-coated surface
⎯ S skin passed — smooth surface
8.3 Surface treatment
⎯ C — Mill passivation
⎯ O — Oiled
⎯ CO — Mill passivation and oiled
8.4 The base metal designations
⎯ T0 01 Commercial
⎯ T0 02 Drawing
⎯ T0 03 Deep drawing
⎯ T0 04 Drawing aluminum killed
...