2 – Normative references:

• ISO 404 instead of EN 10021 General technical delivery requirements
• ISO 4948-1, 4948-2 instead of EN 10020 Classification of steels
• ISO 4967 Non-metallic inclusions (new)
• ISO 7788 instead of EN 10136-2 Surface finish of hot rolled plates
• ISO 9443 instead of EN 10221 Surface quality classes for hot-rolled round bars
• ISO 1035-1, 1035-4 instead of EN 10060 Dimensions and tolerances of hot rolled bars
• ISO 10474 and EN 10204inspection documents
• ISO 148-1 instead of EN 10045-1 Charpy pendulum impact test
• ISO 6892-1 instead of EN 10002-1

4.1 – Classification

Addition of steels C25, C50 as non-alloy quality steels.

5.1 – Mandatory information to be supplied by the purchaser

d) a reference to this part of ISO 683 (ex. 683-1)
e) the designation of the steel type given in table 3 (non-alloy steel; alloy-steel)
f) the inspection documents (2.2, 3.1, 3.2) in accordance with ISO 10474 or EN 10204

7.6 Internal soundness – was eliminated the reference to EN 10308

7.7.3 Surface condition - bars and rods are delivered with surface class 1za2 in accordance with ISO 9443, instead of class A in accordance with EN 10221 in former EN standard

8.1.1 The inspection documents can be after ISO 10474 or EN 10204

8.1.3 The inspection certificate 3.1 or 3.2 shall confirm that the material complies with the requirements of the order

9.4 retests of case hardening steels and criteria are specified in ISO 404, instead of EN 10021

Table 3 – Steel grades and chemical composition

• For all the steels was inserted a minimum limit for Silicon at 0.10%
• For all the steel grades was inserted a maximum limit for Cupper at 0.30%
• Were added six new steels: quality steel C50, special steels C25E/R, C30E/R, 23Mn6, 36Mn6, 42Mn6.
• For all the special steels the maximum limit for Phosporus is now 0.025%, from 0.030% in EN 10083-2 standard.

Table 4 – Permissible deviations between cast and product analysis

• For Carbon between 0.30 and 0.55% the deviation is ±0.03% instead of ±0.02%
• For Manganese between 1.00 and 1.80% the deviation is ±0.06% instead of ±0.05%
• For Sulphur the deviation is  ±0.005% instead of +0.005%
• For Nickel the deviation is +0.03%, instead of +0.05%
• For Cupper the deviation is +0.05% (new)

Table 5 – Hardness limits for +H grades

• For steel C35E/R, C40E/R, C45E/R were added maximum hardness limits at 20, 25 and 30mm from the quenched end

Table 9 – Mechanical properties in the quenched and tempered condition

• For steels C35E/R, C40E/R, C45E/R and 28Mn6 were added minimum impact values for diameters ≤16mm and were lowered with 10J the minimum values for impact for the rest of the diameters (35J->25J, 30J->20J, 25J->15J and 40J->30J)

Table 10 – Mechanical properties in normalized condition

• For steel C50E/R the minimum elongation for bars under 16mm diameter was increased from 11 to 12%

Table 13 – Conditions for heat treatment

• It was modified the hardening temperature for C55 and C60 from 810ºC to 800-805ºC minimum and from 850ºC  to 840-840ºC maximum and for 28Mn6 from 840-880ºC to 830-870ºC
• It was modified the maximum normalizing temperature for C35, C40, C45, C55, C60 by decreasing with 20ºC, from 880-920 to 860-900ºC

Annex B – Supplementary or especial requirements

• was eliminated the mention of non-metallic inclusion content (micro and macro purity)
• B.5 – in case of dispute about chemical composition the analysis shall be carried out in accordance with ISO/TR 9769 instead of EN 10261

Annex D – Dimensional standards applicable to these products (former Annex B)

ISO 1035-1 and 1035-4 are replacing EN 10060 for dimensions and tolerances of hot rolled bars

1 – Scope

NOTE 4 For bright steel production ISO 683-18 is mentioned instead of EN 10277-1 and EN 10277-5

2 – Normative references:

• ISO 148-1 instead of EN 10045-1 instead of EN 10045-1 Charpy pendulum impact test
• ISO 6892-1 instead of EN 10002-1 Tensile testing
• ISO 404 instead of EN 10021 General technical delivery requirements
• ISO 4948-1, 4948-2 instead of EN 10020 Classification of steels
• ISO 4967 instead of EN 10247 Non-metallic inclusions
• ISO 7788 instead of EN 10136-2 Surface finish of hot rolled plates
• ISO 9443 instead of EN 10221 Surface quality classes for hot-rolled round bars
• ISO 1035-1, 1035-4 instead of EN 10060 Dimensions and tolerances of hot rolled bars
• ISO 10474 and EN 10204 Inspection documents

5.1 – Mandatory information to be supplied by the purchaser

d) a reference to this part of ISO 683 (ex. 683-2)
e) the designation of the steel type given  in table 3 (non-alloy steel; alloy steel)
f) the symbol for the required heat-treatment condition
g) the inspection documents (2.2, 3.1, 3.2) in accordance with ISO 10474 or EN 10204

6.1 – Generals

Reference to B.5 – if central soundness of the hot rolled products is important, a minimum reduction ratio (for ex. 4:1)  may be agreed at the time of the enquiry and order.

7.6 – Internal soundness – was eliminated the reference to EN  10308

7.7.3 Surface condition – bars and rods are delivered with the surface class 1za2 in accordance with ISO 9443, instead of Class A in accordance with EN 10221 in former EN standard

8.1.1 The inspection documents can be after ISO 10474 or EN 10204

8.1.3 The inspection certificate 3.1 or 3.2 shall confirm that the material complies with the requirements of the order

9.4 Retests of case hardening steel and criteria are specified in ISO 404, instead of EN 10021

Table 3 – Steel grades and chemical composition

• Were eliminated six old steels: 38Cr2, 48Cr2, 35NiCr6, 36NiCrMo16, 39NiCrMo3, 30NiCrMo16-6.
• Were added two new steels: 41CrNiMo(S)2, 36CrNiMo4
• For all the steels without Boron was inserted a minimum limit for Silicon at 0.10%
• For all the steel grades was inserted a maximum limit for Cupper at 0.40%
• For 51CrV4 the chemical composition was changed, decreasing the limits for Manganese from 0.7-1.1% to 0.6-1.0% and Chromium from 0.9-1.2% to 0.8-1.1%
• The steel name of 38MnB5 is now 39MnB5

Table 4 – Permissible deviations between cast and product analysis

• For Carbon between 0.30 and 0.55% the deviation is ±0.03% instead of ±0.02%
• For Manganese between 1.00 and 1.70% the deviation is ±0.06% instead of ±0.05%
• For Sulphur the deviation is ±0.005% instead of +0.005%
• For the Nickel max 1.00% the deviation is ±0.03%, instead of ±0.05%
• For Cupper the deviation is +0.05% (new)

Table 5 – Hardness limits for +H grades

• For 51CrV4 all the limits were modified (lowered)

Table 6 – Hardness limits for H+ and +HL  grades

• For 51CV4 all the limits were modified (lowered)

Table 8 – Mechanical properties in the quenched and tempered condition

• For 30CrNiMo8 were changed all the limits for yield, tensile strength and elongation. For diameters up to 40mm were decreased with 200-220N/mm2, for diameters 41-100mm were decreased with 100-120N/mm2, for diameter 105-150mm were decreased with 20N/mm2 and for diameters  165-250mm were increased with 30-50N/mm2

Table 11 – Conditions for heat treatment

• It was modified the maximum hardening temperature for 34CrMo(S)4, 42CrMo(S)4, 50CrMo4, 51CrV4 from 870-890˚C to 860-870˚C
• It was modified the end quench test austenitizing temperature for 37Cr(S)4, 41Cr(S)4, 25CrMo(S)4, 42CrMo(S)4, 34CrNiMo6, 30CrNiMo8 from 850˚C to 840-860˚C
• For steel 34CrNiMo6 was modified the type of the quenching from  “Oil or water” to “Oil”

Annex B – Supplementary or special requirements

• Reference for the determination of microscopic non-metallic inclusion content was removed
• B.4 – in case of dispute about chemical composition the analysis shall be carried out in accordance with  ISO/TR 9769 instead of EN 10261
• B.5 – if central soundness of the hot rolled products is important, a minimum reduction ratio (for ex. 4:1) may be agreed at the time of the enquiry and order (New)

Annex D – Dimensional standards applicable to these products

• ISO 1035-1 are 1035-4 are replacing EN 10060 for dimensions and tolerances of hot rolled bars

2 – Normative references:

• ISO 404 instead of EN 10021 General technical delivery requirements
• ISO 4948-1, 4948-2 instead of EN 10020 Classifications of steels
• ISO 4967 instead of EN 10247 Non-metallic inclusions
• ISO 7788 instead of EN 10136-2 Surface finish of hot rolled plates
• ISO 9443 instead of EN 10221 Surface quality classes for hot-rolled round bars
• ISO 1035-1, 1035-4 instead of EN 10060 Dimensions and tolerances of hot rolled bars
• ISO 10474 an EN 10204 inspection documents
• ISO/TR 9769 instead of EN 10261 Method of analysis

4.1 – Classifications

Addition of steel 22Mn6 as non-alloy special steel

5.1 – Mandatory information to be supplied by the purchaser

d) a reference to this part of ISO 683 (ex. 683-3)
e) the designation of the steel type given in table 3 (non-alloy steel; alloy steel)
f) the inspection documents (2.2, 3.1, 3.2) in accordance with ISO 10474 or EN 10204

6.1 – General

Reference to A.4 – if central soundness of the hot rolled products is important, a minimum reduction ratio (for ex. 4:1) may be agreed at the time of the enquiry and order.

7.6 Internal soundness – was eliminated the reference to 10308

7.7.3 Surface condition – bars and rods are delivered with  surface 1za2 in accordance with ISO 9443, instead of Class A in accordance with EN 10221in former EN standard

8.1.1 The inspection documents can be after ISO 10474 or EN 10204

9.3 Retests of case hardening steels and criteria are specified in ISO 404, instead of EN 10021

Table 2, surface condition at delivery – hot worked and pickled (+PI) is also applicable for hot rolled bars now, blooms, billets, forgings.)

Table 3 - Steel grades and chemical composition

• For majority of the steels was inserted a minimum limit for Silicon at 0.15%
• For all the steel grades was inserted a maximum limit for Cupper at 0.30% for non-alloy steels and 0.40% for alloy steels
• Were added three new steels: non-alloy steel 22Mn6, alloy steels 20Cr(S)4 and 24CrMo(S)4
• Were eliminated five old steels: 20MoCr(S)3, 10NiCr5-4, 20NiCrMoS6-4, 14NiCrMo13-4, 20NiCrMo13-4.
• For non-alloy steels (C10, C15, C16, 22Mn6) the maximum limit for Phosporus is now 0.025%, from 0.035% in EN 10084 standard.
• For 15NiCr13 the entire chemical composition was changed (lower limits)
• For 17NiCrMo6-4 the maximum limit of Nickel is increased to 1.6% from 1.5%

Table 4 – Permissible deviations between cast and product analysis

• For Manganese between 1.00 and 1.40% the deviation is ±0.06% instead of ±0.05%
• For Sulphur the deviation is ±0.005% instead of +0.005%
• For Nickel max 1.00% the deviation is ±0.03% instead of ±0.05%
• For Cupper the deviation is +0.05% (new)
• For Boron the deviation is ±0.0003 instead of ±0.0005%

Table 5 – Hardness limits for +H grades

• For 15NiCr13 all the limits were modified (lowered)
• For 17NiCrMo6-4 was modified the minimum hardness at 3mm from 40HRC to 39HRC

Table 6 – Hardness limits for +H and +HL grades

• For 15NiCr13 all the limits were modified (lowered)
• For 17NiCrMo6-4 was modified the minimum hardness at 3mm from 43HRC to 42HRC (+HH) and from 40HRC to 39HRC (+HL)

Table 8 – conditions for heat treating test bars and treatment of steels

• It was inserted a new column for Direct and simple hardening temperature
• It was modified the end quench test austenitizing tempertature as follows: for 15NiCr13 from 880˚C to 850 ±5˚C, for 16MnCr(S)5, 20MnCr(S)5, 18CrMo(S)4, 20NiCrMo(S)2-2 and 17NiCrMo6-4 from 870-880˚C to 900˚C

Annex A – Supplementary or special requirements

• was eliminated the mention of non-metallic inclusion content (micro and macro purity)
• A.3 – in case of dispute about chemical composition the analysis shall be carried out in accordance to ISO/TR 9769 instead of EN 10261

Annex C – Dimensional standards applicable to these products (former Annex B)

ISO 1035-1 and 1035-4 are replacing EN 10060 for dimensions and tolerances of hot rolled bars

Annex C from EN 10084 regarding determining of microscopic non-metallic inclusion content was removed