ISO 630-2:2011 download.Structural steels — Part 2: Technical delivery conditions for structural steels for general purposes.
This part of ISO 830 specfles qualities for steels for general structural use. This part of ISO 630 applies to steel plates rolled on a reversing ml, wide flats, hot-rolled sections and bars. which are used in the as-delivered condition and normally miended far welded or baited slructures
This pert of ISO 630 covers etght steel grades and four qualities. Grades S235, S275. S355, and 5450 are covered In Annex A. Grades $6205, $025.0, $6285 and $0345 are covered in Annex B. Not all grades are available in all qualities, and some qualities have Charpy V-notch requirements.
This part of ISO 630 does not mc*ude the following structural steels, same of which are covered by other International Standards:
— sheet and strip: refer to ISO TC 17ISC 12 Conthnuous mill flat rolled products’,
— tiMular products: refer Ia ISO TC S1SC I Steel tubes’
NOTE Lists of standards covered by ISOTC IT1SC 12 and ISOfTC 515C I are avadable on the ISO Web Me.
2 Normative references
The following referenced documents are indispensable for the apøcation of this document For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (Inducing arty amendments) applies.
ISO 630-I, Structural steels — Part 1: General techracel delivery conditions for hot-rolled products
3 Terms and definitions
For the purposes of this document the terms and definitions given In ISO 630-1 and the folIowW,g appiy
3.1
at-rolled
steel without any special rolling andlor heal treatment concition
3.2
normalized rolled
steel railed with a process ii which the fInal deformation is carried out in a certain tençerature range leading to
a material concition equivalent to thai obtained alter normalizing so that the specified values of the mechanical
properties are retained after normalizing
NOTE In Intemabonal publications for both normalized rolbng. as well as thermnom.chanical roiIin. the expression ‘controlled lolling’ may be found.
3.3
normalized
steel produced by heating to a suitable temperature above the transformation range and then cooling in air to
a temperature substantially below the transformation range
3.4
thermomechanical process.d
steel rolled with a process in which the final deformation Is carried out in a certam temperature range leading to a material condition with certain properties which cannot be achieved or repeated by heat treatment alone
NOTE I Hot lormmg or post weld heat treatment above 560 C may lower the elrengih values sad should not be performed. Flame Mrsl.nWg can be app(atd In accordance with relevant technical reoorivn.ndatons.
NOTE 2 Th.rrnom.ch.nacal rolling can rick4e processes with an Incressang cooling rate with or without tempering, Induding s*it4imperlng but excluding direct quenching and cuendng and tempering
NOTE 3 In some putilcalone. the wording ‘Thermomechanical Control Proceas Is also used.
4 ClassificatIon and designation
4.1 Classification
The steel grades specified in this part of ISO 630 shaM b. classified as non.alIo, or aitoy quality steels.
4.2 Grades and qualities
This part of ISO 630 specifies elgit steel grades. Grades S235, S275, 6355. and 5450 are specified in Annex A. Grades SG205, S0250, 50295, and 50345 are specilled in Annex B. Each grade is avalable in up to four quaMbes. These grades and qualities differ m (heW specified mechanical properties and Impact energy requirements.
Quality k no impact testing.
Quality B: mpact testing at 20 C.
Quality C: impact testing at 0 C.
Quality D: impact testing at 20 C.
4.3 Use of normative annexes A and B
The requarements of Annex A or Annex B are to be regarded separately Each is independent of the other without combining in any way.
5 InformatIon to be supplied by the purchaser
5.1 Mandatory information
The information that shall be supØed by the purchaser at the time of the order is specified in ISO 630.1.
5.2 OptIons
The options of ISO 630-1 apply (see ISO 630-I). In addition, the following option applies to products according to this part of ISO 630.11 the purchaser does not Indicate a wish to implement any of these options at the time of ordering, the products shall be supplied in accordance with the basic specification (see 5.1).
a) Required delivery condition.
b) Testing at impact properties in the transverse direction using Charpy V-notch test pieces In accordance with ISO 630-1.
6 Requirements See ISO 630-i
6.1 Steel-makIng process
See ISO 630-1
If a special sleet-malung process has been specified, this shal be reported in the inspection document
6.2 Delivery condition
Al the manufacturer’s decretlon. the products covered by this part 0f ISO 630 are deft vered in the as-roled
Condition. normalized rolled, normalized. or thermomechanecal processed condition. The delvery condndn Is
Indicated Wi the inspection documenL
6.3 ChemIcal composition
6.3.1 Heat analysis
The chemical composition determined by heat analysis shat comply with the values specified In Table Al or Table 8.1.
6.32 Product analysis tolerances
The product analysis of grades S235, S275, S355 end S450 shall comply with the values given m Table A.2.
The perrhitled deviations on analysis of grades SG205, SG250, SG285 and SG345, relative to the values for
heat analysis, are given In Table B.2
6.3.3 Carbon-equIvalent value
The carbon-equivalent value (CEV) reqiirements for the grades Wi Annex A are given in Table A3,
6.4 Mechanical properties
6.4.1 Tensile properties
The tensile properties at ambient temperature shall comply with the values specified in Tables A4 and A.5 or Table 8.3.
6.4.2 Charpy V-notch Impact tests
The Impact properties of Charpy V-notch test pieces shal comply with the values specified in Table A.6 or Table B.4. The orientation of the specimens shall be longitudinal unless baneverse orientaDon Is agreed between purchaser and manufacturer (see 5.2 and ISO 630.1).
6.5 Surface conditions See ISO 630-1
6.6 Internal soundness See ISO 630-1.
67 Dimensions and tolerances on dimensions, shape and mass
See ISO 630-1.
7 Inspection
Type of a,specbon doaiments (specific or non-specific) shall be spectfled Refer to ISO 630-1:2011, 7.1.
B Sampling — Frequency of testing
8.1 VerIfication
The verification of mechanical properties shall be by heat. Verification by lot shall be by agreement between the producer and purchaser.
8.2 Teat units
8.2.1 Annex A
The test Laiit shall contain products of the same farm, grade, quality, and clehvery condition, and of the same thickness range as specified in Table A4 (or the yield strength, arid thai be:
— byheat4otonsorpertthereof;
— 60 tons or part thereof far heavy sections with a mass> 100 kglm
— 80 tons or part thereof for all sections ii the mass of the heat exceeds 200 tons.
By agreement at the tinie of ordering. two tests by heat may be used.
8.2.2 Annex B
The test urWt shall contain products of the same fomi, grade, and quality, delivery condition and the same Thickness range as specified In Table B,3 for the yield strength and shall be 50 tons or part Thereof.
By agreement at time of ordenng. two tests by heat may be used
9 Test methods
See ISO 630-1
10 Marking
See ISO 630-1.