Iranian Classification Society Rules

Section 2-2 Semi Finished Products for Rolled Steels

211. Application

1. The requirements in this Section apply to tests and inspection for the approval of manufacturing process of semi-finished products such as slabs, blooms and billets for the rolled steels (including rolled steel bars, to which Pt 2, Ch 1, Sec 6 of the Rules apply) as specified in Pt 2, Ch 1, Sec 3 of the Rules.

2. Requirements other than those specified in this Section are to be in accordance with the require- ments of Section 2-1.

212. Data to be submitted

The following reference data in addition to those specified in 102. are Society.

(1) Type of products (ingots, slabs, blooms, billets)

(2) Material grade (e.g. A , D , etc.) and range of thickness

(3) aim material properties

(A) range of chemical composition and aim analyses, including grain and residual elements, for the various grades of steel; if the range depends on thickness and supply condition, the different ranges appropriate.

to be submitted to the

refining, micro alloying of chemical composition are to be specified, as

(B) Aim maximum carbon equivalent(Ceq.) according to Pt 2 of the Rules. For higher strength grades with low carbon content C < 0,13 %, aim maximum Pcm content

KV). The statistics are intended to demonstrate the capability to manufacture the steel prod- ucts in accordance with the requirements.

(4) Steelmaking

(A) Steel making process and capacity of furnaces or converters

(B) Raw material used

(D) Desulphurisation and vacuum degassing installation, if any

(E) Casting methods(ingot or continuous casting) : In the case of continuous casting, information relevant to type of casting machine, methods to prevent inclusions and segregation control

etc., is to be provided as appropriate.

(F) Ingot or slab

size and weight

(G) Ingot or slab treatment(scarfing and discarding procedures), etc

213. Approval tests

1. Test samples and specimen

(1) For each type of steel and for each manufacturing process (e.g. ingot casting, continuous cast- ing), one test product with the maximum thickness and one test product with the minimum thickness to be approved are in general to be selected for each kind of product (ingots, slabs, blooms/billets). The selection of the casts for the test product is to be based on the typical chemical composition, with particular regard to the specified Ceq or Pcm values and grain refin- ing micro-alloying additions.

(2) The test samples are to be taken, unless otherwise agreed, from the product (slabs, blooms, bil- lets) corresponding to the top of the ingot, or, in the case of continuous casting, a random sample.

2. Approval test and acceptance criteria

(1) Approval tests are to be carried out in the presence of the Surveyor at the manufacturing plant and approval test items are to be as given in Table 2.2.4.

(2) Test methods and acceptance criteria are to be as given in Table 2.2.4. However, where ac-

cordance with these requirements are difficult, decisions are left to the discretion of the Society.

(3) In addition, for initial approval and for any upgrade of the approval, the Society will require full tests indicated in Sec 2-1. 203. to be performed at rolling mill on the minimum thickness semi finished product.

Guidance for Approval of Manufacturing Process and Type Approval, Etc. 2015 15

Ch 2 Approval of Manufacturing Process Ch 2, Sec 2-2

(4) In case of a multi-caster work, full tests on finished products shall be carried out for one and reduced tests (chemical analysis and sulphur print) for the others.

caster

Table 2.2.4 Approval test items and acceptance criteria of Semi Finished Products for Rolled Steels

Approval test items

Approval Testing method

acceptance criteria

Chemical analyses

Both the ladle and product analyses are to be reported. In general the content of the following elements is to be checked: C, Mn, Si, P, S, Ni, Cr, Mo, Al, N, Nb, V, Cu, As, Sn, Ti and, for steel manufactured from electric or open-hearth furnace, Sb and B.

The chemical composition by ladle analysis is to comply with the requirements in Pt 2, Ch 1, Sec 3 of the Rules. Excess difference in the chemical compositions between melt analysis and product analysis is not to be accepted.

Sulphur prints

Sulphur prints are to be taken from product edges which are perpendicular to the axis of the ingot or slab. These sulphur prints are to be approximately 600 mm long taken from the centre of the edge selected, i.e. on the ingot centreline, and are to include the full product thickness.

Segregation, etc, deemed to have negative effect are not to be present

3. In addition to those specified in 105. 1. a reduction of the indicated number of casts, product thicknesses and types to be tested or complete suppression of the approval tests may be considered subject to the approval by the Society on the basis of the preliminary information submitted by the manufacturer in case any of the following (1) or (2) is relevant. On the other hand, an increase of the number of casts and thicknesses to be tested may be required in the case of newly developed types of steel or manufacturing processes.

(1) Approval already granted by other Classification Societies and documentation of approval tests performed.

(2) Types of steel to be approved and availability of long term statistic results of chemical proper-

ties and of mechanical tests performed on rolled products.

214. Certification

1. On the approval certificate the following information is to be stated:

(1) Types of steel (normal or higher strength)

(2) Type of products (ingots, slabs, blooms, billets)

(3) Steelmaking and casting processes

(4) Thickness range of the semi-finished products

2. It is also to be indicated that the individual users of the semi finished products are to be approved for the manufacturing process of the specific grade of rolled steel products they are going to manu- facture with those semi finished products.

215. Changes in the manufacturing process

In addition to those specified in 107., the manufacturer has to submit to the Society the documents together with the request of changing the approval conditions, in the case of the followings:

(1) Change of the manufacturing process (steel making, and casting)

(2) Change of the maximum thickness (dimension)

(3) Change of

the chemical composition, added element, etc.

16 Guidance for Approval of Manufacturing Process and Type Approval, Etc. 2015

Ch 2 Approval of Manufacturing Process Ch 2, Sec 2-3

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