PSA PEUGEOT – CITROËN
B53 3108
NORMES VEHICULES
STEEL WELDABLE FLAT PRODUCTS
EXTRA MILD FOR PRESSING
HOT ROLLED
Page 1/4
THIS NORME REPLACES NORME B53 3110
This is a translation, the French original shall be used in all cases of litigation Date of translation : 10/03/2003
CONTENTS
1. OBJECT 1
2. CHARACTERISTICS OF PRODUCTS IN DELIVERY CONDITION 1
2.1. GENERAL 1
2.2. CHEMICAL COMPOSITION (%) 2
2.3. MICROSTRUCTURAL CHARACTERISTICS 2
2.4. MECHANICAL CHARACTERISTICS 2
3. EXPRESSION ON DOCUMENTS 3
3.1. UNIMPORTANT MATERIAL QUALITY 3
3.2. ADDITIONAL SPECIFICATIONS 3
4. RECORDS AND REFERENCE DOCUMENTS 4
4.1. RECORDS 4
4.2. REFERENCE DOCUMENTS 4
4.3. EQUIVALENT TO : 4
4.4. CONFORMS TO : 4
4.5. KEY-WORDS 4
1. OBJECT
This norme defines the requirements specific to flat products in extra mild non alloy, hot rolled steel for
pressing, uncoated or coated, before or after forming, and of a thickness greater than or equal to 1,50 mm
delivered in the form of :
• Sheets,
• Wide strip and wide slit strip in coils,
• Lengths.
It must be accompanied by documents defining the general requirements for flat products :
• B53 3020 Designations – Symbols.
• B53 3050 General requirements for supply.
• B53 3055 Metallurgical requirements – Tests.
• B53 3070 Specific technical requirements, hot or cold rolled.
• B53 3072 Dimensional requirements, hot or cold rolled.
2. CHARACTERISTICS OF PRODUCTS IN DELIVERY CONDITION
2.1. GENERAL
The products must be free from defects detrimental to their use.
They must be suitable for pressing, welding, bonding and paint coating.
These products are auto annealed and pickled.
A specific roughness may be required.
OR : 01/11/1991 C : 21/10/1996 General use
PSA PEUGEOT - CITROÊN
STEEL FLAT PRODUCTS WELDABLE EXTRA MILD B53 3108 2/4
2.2. CHEMICAL COMPOSITION (%)
GRADE SHEET METAL Ceq (1) C Mn Si P S Al
DESIGNATION Max. Max. Max. Max. Max. Max. Min.
1C 1C 0,18 0,10 0,50 0,04 0,040 0,035 0,020
3C 3C 0,14 0,08 0,40 0,04 0,025 0,025 0,020
Mn + Si
(1) Carbon equivalent, Céq = C + . Mandatory values.
6
Note : The addition of alloy micro elements is possible after agreement.
2.2.1. DERIVED GRADES
1C.R Derived grades for dipped galvanising of parts after forming.
3C.R Differ from the chemical composition only by :
Si ≤ 0,03 %
and Si + 2,5P ≤ 0,09 %
Note : The choice of derived grades involves, in all cases, functional tests and requires agreement from
the appropriate departments.
2.3. MICROSTRUCTURAL CHARACTERISTICS
2.3.1. CLEANLINESS RELATING TO INCLUSIONS
The metal must be clean and without blowholes. The field with the highest count of non-deformable
inclusions, must not exceed for each type of inclusion, the rating 2 on the JERNKONTORET scale in
conformity with norme NF A 04-106.
2.3.2. STRUCTURE
The structure must be non banded but with grain uniform in form and size.
The grain sizes allowed, measured according to norme NF A 04-102 are shown in the table in § 2.4.
A maximum variation in grain size of 2 will be tolerated between the sheet surface and core within the
limit required in § 2.4.
2.4. MECHANICAL CHARACTERISTICS
These must be guaranteed for 3 months from the date of availability.
The tensile test specimens are taken in the transverse direction. The test conditions are defined in norme
B53 3055.
GRADE Rp 0,2 (Mpa) Rm (Mpa) A % min. HRB HB GRAIN
Transverse Transverse max. max. AFNOR
direction direction (1) (1) min.
ISO 20 X 80 LO = 5,65 so
e<3 e≥3
1C (2) 200 330 25 28 70 125 4
330 440
3C 220 320 31 37 61 108 6
280 370
(1) For information.
(2) Grade 1C is reserved for bending, flat cutting and roll forming within the allowable geometric
tolerances.
OR : 01/11/1991 C : 21/10/1996 General use
PSA PEUGEOT - CITROÊN
STEEL FLAT PRODUCTS WELDABLE EXTRA MILD B53 3108 3/4
3. EXPRESSION ON DOCUMENTS
3.1. UNIMPORTANT MATERIAL QUALITY
(general case)
The material is defined in the following form :
• Sheet.
• Reference to this norme
• Nominal thickness supplied in mm (*).
Example :
• Sheet (norme B53 3108 or B53 3106) e=*mm
The choice of manufacturing method (hot or cold rolled) and the grade is left to the Manufacturing
departments; the choice of appearance is left to the discretion of Engineering, Quality and Manufacturing
departments.
3.2. ADDITIONAL SPECIFICATIONS
If a particular characteristic is required (ex.: yield strength) the required grade is shown.
Example :
• Sheet 3 C (norme B53 3108) e = *mm.
Note : The manufacturing method for hot rolled sheets leads to important variations in thickness as well
as surface defects which may detrimental to the fatigue resistance of parts. This must be taken into
account when choosing the material.
OR : 01/11/1991 C : 21/10/1996 General use
PSA PEUGEOT - CITROÊN
STEEL FLAT PRODUCTS WELDABLE EXTRA MILD B53 3108 4/4
4. RECORDS AND REFERENCE DOCUMENTS
4.1. RECORDS
4.1.1. CREATION
• OR : 01/11/1991 – CREATION OF THE NORME.
4.1.2. SUBJECT OF THE MODIFICATION
• B : 01/02/1993 – CREATION OF DERIVED GRADES FOR DIPPED GALVANISING.
• C : 21/10/1996 – INTRODUCED INTO IDEM (French only).
4.2 REFERENCE DOCUMENTS
4.2.1. PSA DOCUMENTS
4.2.1.1 Normes
B53 3020 STEEL – FLAT PRODUCTS – DESIGNATIONS - SYMBOLS
B53 3050 STEEL – FLAT PRODUCTS – GENERAL REQUIREMENTS FOR SUPPLY
B53 3055 STEEL OR ALUMINIUM FLAT PRODUCTS HOT OR COLD ROLLED –
METALLURGICAL REQUIREMENTS - TESTS
B53 3070 STEEL – FLAT PRODUCTS - HOT OR COLD ROLLED – SPECIFIC TECHNICAL
REQUIREMENTS
B53 3072 STEEL – FLAT PRODUCTS - HOT OR COLD ROLLED – DIMENSIONAL
REQUIREMENTS
4.2.1.2. Others
4.2.2. EXTERNAL DOCUMENTS
DEX NF A04-102 PRODUITS SIDERURGIQUES – DETERMINATION DE LA GROSSEUR DU
GRAIN FERRITIQUE OU AUSTENITIQUE DES ACIERS
DEX NF A04-106 PRODUITS SIDERURGIQUES – METHODES DE DETERMINATION DE LA
TENEUR EN INCLUSIONS NON METALLIQUES DES ACIERS CORROYES –
PARTIE II : METHODE MICROGRAPHIQUE A L’AIDE D’IMAGES-TYPES
4.3. EQUIVALENT TO :
4.4. CONFORMS TO :
4.5. KEY-WORDS
CHAUD, EMBOUTISSAGE, EXTRA-DOUX, PLATS, PRODUITS, SOUDABLE
(hot, pressing, extra mild, flat, products, weldable)
OR : 01/11/1991 C : 21/10/1996 General use
