52812 fiat



STEEL SHEETS AND STRIPS MICROALLOYED, HOT ROLLED, CLOSE TEMPERATURE CONTROL, HIGH YIELD STRENGTH

  MATERIALS STANDARD

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 

       

Supervisor: Supervisor :

FEDERICI Claudio

D.I.P. D.I.P. – Central Laboratories Laboratories Tel. 011.6835758 011.6835758

Manager: Manager :

BOTTAZZI Mauro

D.I.P. – Central Laboratories Tel. 011.6833070 011.6833070

                 

                     

SCOPE To define the characteristics for microalloyed low carbon, close temperature control hot rolled, high yield strengt h steel sheets and strips, for medium and light drawing and cold bending

                  

Reference GM GMW3032 M – ST – S High Strength Sheet Steel (180 MPa – 550 MPa Yield Strengths)

                         

This Standard consist s of 10 pages







 ––

Oct. 84

3rd Edition – Fully revised .

(AS)

 ––

Jan. 02

4th Edition – Completely revised to comply to GM Standard GMW3032 M–ST–S.

(AD AD))

                  

    

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

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



| § ‘‘A’’ : TEST EQUIPMENT The equipment required for the tests is indicated in the Standards listed in para. “B”.

| § ‘‘B’’ REFERENCES

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

|50020

| Material data processing coding TMD

|50108

| General test – Rockwell hardness test. TMD

|50113

| Tension testing – general purpose tests. TMD

|50116

| Tests on metals – Determination of formability indices. TMD

|50125

| General test – Bend test. TMD

|50240

| Requirements for ferrous metals – Pipes, sheets, wide strips, flat strips and sections – Test procedures and preparat ion of specimens. TMD

|52120

| Chemical composition variations on steel products. TMD

|54406

| Hot rolled steel sheet and strips – Dimensions and tolerances. F2

|9.01102

| Quality of FIAT AUTO S.p.A. supplies CFO

|9.50240

| Steel sheets and strips – Technical supply requirements. CMD

|3244–UNI

| Microscopic inspection of ferrous materials – Assessment of non metallic inclusions in steels by means of standard images.

|3245–UNI

| Microscopic examination of ferrous materials. Determination of the size of austenit ic or ferritic grain in the steel.

| 000–EN.78.0 | Authorizat ion to use products that vary from the technical specificat ions. (D.P: Dept – Industrial Methodo logy Development)

    

 

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1 GENERAL 1.1 Material Low carbon steel sheet with a thickness betwee n 1 and 16 mm, microalloyed, anti–ag ing, not for heat treat ment , suppl ied as close tempera tur e contr ol hot–r olled in sheet s or coils for medium and light drawing and cold bending applications in order to avoid altering mechani cal properties. 1.2 Application Highly stressed structural parts. 2 EXAMPLE OF INDICATION ON DRAWING, N OF DATA PROCESSING CODE AND CORRESPONDING FIAT AND G.M. CODES. 

Example of indication on drawing and number of data processing code

MAJOR Steel sheets and strips not to be used in NEW DESIGNS started after 01/01/2002.

INDICATION ON DRAWING 

Code Number Data processing (As per Standard 50020)

FE E 275

20165

FE E 355

20153

FE E 420

20112

FE E 490

20154

 This identifica tion of the semi–finished product is to be completed with the associated symbol regarding appearance and surface finish as per Procurement Specification 9.50240. The general supply conditions are indicated in Procurement Specification 9.50240.

    

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

52812









Example of indication on drawing, n of data processing code and correspondence to GMW

MAJOR Steel sheets and strips to be used in NEW DESIGNS started after 01/01/2002.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

INDI CATION ON DRAWING 

Code Number Data processing (As per Standard 50020)

CORRISPONDENCE TO GM W

FEE 270

20186

GMW 3032 M – ST – S HR 270

FEE 300

20187

GMW 3032 M – ST – S HR 300

FEE 340

20188

GMW 3032 M – ST – S HR 340

FEE 380

20189

GMW 3032 M – ST – S HR 380

FEE 420

20190

GMW 3032 M – ST – S HR 420

FEE 500

20191

GMW 3032 M – ST – S HR 500

 This identification of the semi – f inished product is to be completed with the associate d symbol regarding appearance and surface finish as per Procurem ent Specification 9.50240. The general suppl y condit ions are indicat ed in Procur eme nt Speci fic atio n9.50240.

3 CLASSIFICATION AND CHARACTERISTICS TO BE CHECKED 3.1 General applications Unless otherwise specified when ordering, the tables indicated in items 5 and 6 are to be compli ed to .

    

  

52812

 Designs started before 01/01/2002

CHARACTERIS TICS TO BE CHECKED (X) MATERIAL

APPLICATIONS  (GENERAL)

Chemic al composition

Tension hardness and bending

St ru ct ur e

R es il ie nce

FE E 275

Parts with deep drawings

(X)

(X)

(X)

(X)

FE E 355

Parts with medium bending and drawing

(X)

(X)

(X)

(X)

FE E 420

Very stressed parts with medium and light bending and drawing

(X)

(X)

(X)

(X)

FE E 490

Very stresse d part s with light bending and drawing

(X)

(X)

(X)

(X)

 New designs started after 01/01/2002

CHARACTERIS TICS TO BE CHECKED (X) MATERIAL

APPLICATIONS  ( GENERAL)

Chemical composition

Tension and bending

Formability index

Structure

FEE 270

Parts with difficult bending and drawing

(X)

(X)

(X)

(X)

FEE 300

Parts with medium a nd difficult bending and drawing

(X)

(X)

(X)

(X)

FEE 340

Parts with medium bending and drawing

(X)

(X)

(X)

(X)

FEE 380

Very stressed parts with medium and light bending and drawing

(X)

(X)

(X)

(X)

FEE 420

Very stresse d part s with light bending and drawing

(X)

(X)

(X)

(X)

FEE 500

Very stresse d part s with bending and forming

(X)

(X)

(X)

(X)

    

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      



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

3.2 Special applications For very demanding applications and only for exceptional cases, the order is to have attached the “Rolled product data sheet” appropriately prepared by the “Product Definition Services”. An example of this form is illustrat ed in Procurem ent Specification 9.50240. The material identific ation is to be slightly changed with the addition of

“KP” in high case

preceded by a dash. Example:

For old designs:

FE E 355 F – KP.

For new designs:

FEE 340 F – KP.

3.3 Variances If material is used that has character istics different to those indicated below, the Variance Authoriz ation Request Procedure 000–EN.78.0 and Procurement Specification 9.01102 are to be applied.

4 SURFACE APPEARANCE 4.1 Appearance and finish                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         

For definition of appearanc e ratings MH, MG or MF see procurement Specificat ion 9.50240.

 Visual inspection The rolled product s are to be free of defects tha t could adversely affect norm al use. The surface s are to be technically clean , free of rust and foreign matter. Flaws that could cause failures duri ng service, damage to equipment, welding or brazing problems or paint or protect ive coating adhesion difficult ies are not allowed. According to the spec ificatio ns of the order, the rolled sheets may be supplied with as–rolled or trimm ed edges. Edge condition shall not jeopardize semi finished product applicatio n.

    

 

52812



 % LADLE ANALYSIS Rare earth elements may be added (TR) to reduce the transverse effect. Maximum allowed variatio ns are indicated in Standard 52120.  Design s started before 01/01/2 002

MATERIAL

C Max.

Mn Max.

Si Max.

P Max.

S Max.

Al min.

FE E 275

Nb min.  0.015

0.10

0.60

FE E 355

0.020 0.40

0.025

0.025

0.020

FE E 420

0.11

1.00

0.030

FE E 490

0.12

1.60

0.040

 No other microalloy elements are allowed, unless otherwise agreed upon when ordering.

 New designs started after 01/01/2002

MATERIAL

C Max.

Mn Max.

FE E 270

1.00

FE E 300

1.30

FE E 340

1.50 0.12

FE E 380

1.50

FE E 420

1.60

FE E 500

1.70

P Max.

S Max.

Al min.

Si Max.

0.030

0.030

0.015

0.50

Microalloy elements: Nb 0.015 to 0.040 Nb + Ti + V  0. 2

    

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

                                  

           

 CHARACTERISTICS:  Mechanical properties (Designs started before 01/01/2002) Resilience test on specimen longitudinal in direction of rolling

Tension test (Standard 50113)  Min elongation %

                                                      

Load unit Failure R

Designation of semi–finished product

N/mm 2

Load unit yield Rs min.

at o of yield – break 

N/mm2

Rs/R max..

Hardness t est (Rockwell)

Test f or bending

sp per tan-dard 50108)

sp per tan-dard 50125)





Specimen longitudinal in direction of rolling

Index of formability (As per Standard 50116)

  

(As per Standard 50130) 

A80 s