Company standard of Baoshan Iron & Steel Co., Ltd.

Car structure with hot steel sheet and strip

Q/BQB 310-2003
Replaces Q/BQB 310-1999 BZJ311-1999

1 Scope

This standard specifies Car structure with hot steel sheet and strip in the classification and code name, size,

shape, weight, technical requirements, inspection And testing, packaging, marking and inspection of

documents.

This standard applies to the production of Baoshan Iron & Steel Co., Ltd., has good cold forming

properties of carbon and micro-alloy steel hot-rolling strip and the resulting cross-section into a vertical steel

plate and the slit cut into strips, take steel sheet and strip as code as follow.Products for the manufacture of

automobile beam, crossbeam, Rolling wheels, Automotive Transmission Shaft Tube, automobile axle

housings and other structural.

2.References

The following documents by the terms of this standard reference and become the standard terms. For dated

references, subsequent to all of the amendments (excluding corrections) or revisions do not apply to this

standard, however, encourage the parties to reach an agreement under this standard to explore the possibility to

use the latest version of these documents . For undated reference documents, the latest versions apply to this

standard.

GB/T 222－1984 Method of sampling steel for determination of chemical composition and permissible

variations for product analysis

GB/T 223 Methods for chemical analysis of iron ,steel and alloy

GB/T 228－2002 Metallic materials—Tensile testing at ambient temperature

GB/T 232－1999 Metallic materials--Bend test

GB/T 2975－1998 Steel and steel products for mechanical testing location and preparation

GB/T 8170－1987 Rounding Rules

Q/BQB 300－2003 Hot-rolling steel sheet and strip packaging, marking and quality certification for

Q/BQB 301－2003 Hot-rolling steel sheet and strip size, shape, weight and tolerances

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3.classification and trademark

3.1 Steel sheet and strip the trademark, nominal thickness, usage and product categories as shown in Table 1

3.2 Divided by the edge of the state

edge trimming EC

mill edge EM

Divided by the surface treatment

acid washing surface

Non-acid washing surface

3.4 Divided by surface quality

Common surface FA

Higher surface FB

Table 1

Trademark Nominal Use Product category

a
thickness of

mm

SAPH310 1.6 ~ 16.0 For the required processing behavior of the Hot-rolled steel plate

SAPH370 1.6 ~ 12.5 vehicle frame, wheels and other automotive hot rolled steel hot

SAPH400 1.6 ~ 12.0 structural parts rolled slit strip

SAPH440 1.6 ~ 4.5

QStE340TM 3.0 ~ "10.0 Requirements for good performance and a higher Hot-rolled steel plate

QStE380TM QStE420TM cold-forming or high-strength requirements of hot rolled steel hot

QStE460TM QStE500TM structural parts such as automobile frames rolled slit strip

B330CL 2.5 ~ 4.0 Good cold forming properties, used to make car Hot-rolled steel plate

B380CL 2.7 ~ 14.0 rolled wheel rim and spokes hot rolled steel hot

B420CL 3.0 ~ 5.0 rolled slit strip

B320L 2.0 ~ 4.0 For the manufacture of automobile frames, beams Hot-rolled steel plate

B420L ≤ 6.0 with hot rolled steel hot

B510L ≤ 8.0 rolled slit strip

B510DL 4.0 ~ 7.0

B550L 4.0 ~ 8.0

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B440QZR ≤ 8.0 Useful for the manufacture of automotive Hot-rolled steel plate

B480QZR 4.0 ~ 8.0 transmission hot rolled steel hot

rolled slit strip

B440QK (BQK440) 4.0 ~ 8.0 Used for the manufacture of automobile axle Hot-rolled steel plate

housing hot rolled steel hot

rolled slit strip

a
Note: Figures in brackets can be used to grade the end of 2005. surface for pickling hot-rolled steel sheet and strip,

nominal thickness ≤ 6.0mm.

4 Order for the required information

4.1 user need to supply the following information before making orders:

a) Product name(steel sheets or strips)

b) The Product Standard code

c)trademark

d) Product specifications and size, roughness accuracy

e) Marginal state

f)the grade of surface quality

g)the way of packing

h)usage

i)other

If ordering contract does not indicate the surface treatment，pickling the surface of non-delivery. For

non-pickling hot-rolled steel sheet and strip the surface, did not say when the dimensional accuracy, in addition

to the standard special provisions to normal thickness precision in the delivery Q/BQB301. Unspecified

marginal state, the strip of not trimming the state of delivery, delivery of steel to cutting edge status For

pickling the surface of hot rolled steel sheet and strip, Unspecified dimensional accuracy, in addition to the

special provisions of this standard to Q/BQB301 higher thickness accuracy in delivery 3-33Q/BQB 310-2003;

Unspecified margin status, quality level and whether the surface coating oil, to cutting-edge state, the higher

the oil coated surface, and delivery; did not say when the coil diameter to coil diameter 610mm delivery.

4.2 Tag example

Acoording to Q/BQB310-2003 the deliveried hot rolled steel sheet with surface non-picklinged, whose

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grade is SAPH400, thickness is 3.0mm, precision is PT.A class, width is 1500mm, cutting edge (EC), the

length is 5000mm, is marked as:

Q/BQB310－2003,SAPH400,3.0（PT.A）×1500(EC)×5000

Q/BQB310-2003, SAPH400 hot-rolled steel plate, 3.0 (PT.A) × 1500 (EC) × 5000

Acoording to Q/BQB310-2003 the deliveried hot rolled and oiled steel with pickling surface, whose grade

is SAPH400, surface quality level is FB, the thickness is 3.0mm, precision is PT.B class, width is 1500mm,

cutting edge is (EC) and coil diameter is 610mm,is marked as:

Q/BQB310-2003, SAPH400 pickling hot-rolled steel, FB, 3.0 (PT.B) × 1500 (EC) × C, Volume 610 diameter

5 size, shape, weight and tolerances

5.1 The thickness tolerances of B330CL, B380CL, B420CL shall comply with Q/BQB301 high accuracy

(PT.B) requirements.

5.2 The thickness tolerances of B440QZR, B480QZR shall comply with the provisions of Table 2.

5.3 Other dimensions, shape, weight and tolerances in accordance with the provisions of Q/BQB301.

Table2

Trademark Nominal Thickness mm Thickness Tolerance mm

+0.2
<3.0
-0.1

B4400QZR +0.25
3.0~4.0
-0.15

>4.0~8.0 ±0.25

B480QZR 4.0~8.0 ±0.25

6. Technical Requirements

6.1 grade and chemical composition

6.1.1 steel grade and chemical composition (melting analysis) should be consistent with the provisions of Table

3.

6.1.2 Residual copper content in steel should not exceed 0.20%, chromium and nickel content should be not

more than 0.15% for the residual element not to be

Factor analysis, but should be guaranteed to meet the above requirements.

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6.1.3 The allow deviation of refined chemical composition of the steel sheet and strip should be consistent with

GB / T 222's provisions

6.2 smelting method

Steel sheet and strip steel used in sedation is the calmed steel for the oxygen converter steel smelting.

6.3 Delivery Status

The steel plate and strip deliveried in hot-rolled state.

6.4 Surface treatment way

6.4.1 There are two ways which is non-pickling and pickling used in the surface treatment way.

6.4.2 The steel sheet and strip with pickling surface can be oiled or not oiled delivery. The supplier guaranteed

that the oil coated steel sheet and strip after pickling should not be rust during three months since the alllow

delivery date and the coating film should be alkaline aqueous solution can be used to eliminate out in normal

packaging, transport, handling and storage conditions. For requests to non-oiled side of pickling steel sheet and

strip supply, should be give clear indication in the contract. Not coated steel sheet and strip pickling oil are

easy to produce rust and scratch in transport and manufacture processing, and the suppliers do not give

guarantee.

6.5.1 steel sheet and strip the mechanical and process performance should be consistent with the corresponding

Table 4, Table 5, Table 6 and 7requirements

Table3

Chemical composition%
trademark
C Si Mn P S Ti Nb Alt

SAPH310 ≤0.1 ≤0.3 ≤0.5

≤0.035 ≤0.035
SAPH370 ≤0.21 ≤0.3 ≤0.75
- - ≥0.01
SAPH400 ≤1.20
≤0.21 ≤0.30 ≤0.030 ≤0.025
SAPH440 ≤1.50

B440QK
≤0.21 ≤0.35 ≤1.80 ≤0.03 ≤0.025 - - ≥0.01
(BQK440)

QstE340TMa ≤0.12 ≤0.50 ≤1.30 ≤0.030 ≤0.025 ≤0.22 ≤0.09 ≤0.015

QstE380TMa ≤1.40

QstE420TMa ≤1.50

QstE460TMa ≤1.60

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QstE500TMa ≤1.70

B330CL ≤0.10 ≤0.05 ≤0.50 ≤0.030 ≤0.025 - - ≥0.020

B380CL ≤0.12 ≤0.05 0.50~1.20 ≤0.030 ≤0.025 - - ≥0.020

B420CL ≤0.12 ≤0.30 0.80~1.20 ≤0.030 ≤0.025 - - ≥0.020

B320L ≤0.10 ≤0.05 ≤0.50 ≤0.030 ≤0.035 - - -

B420CL ≤0.12 ≤0.50 ≤1.20 ≤0.030 ≤0.025 - ≤0.04 -

B510L ≤0.16 ≤0.50 ≤1.60 ≤0.03 ≤0.025 - ≤0.06 -

B510DL ≤0.18 ≤0.30 ≤1.60 ≤0.025 ≤0.020 - - ≥0.010

B550L ≤0.16 ≤0.50 ≤1.60 ≤0.030 ≤0.025 - - -

B440QZR ≤0.12 ≤0.50 ≤1.30 ≤0.030 ≤0.025 - ≤0.04 -

B480QZR ≤0.16 ≤0.50 ≤1.50 ≤0.030 ≤0.035 - - -

a)Selected by the supplier with Nb and / or Ti, can be added in addition to V, but three kinds of element content shall not exceed

0.22%.

Table 4

Tensile testa Bending

Elongation% testb 180

Lower yield strengthc Diameter of

Ten-sile L0=50mm L0=200mm
trademark MPa the bending
stre-ngth b=25mm b=40mm
center
MPa
Nominal Thickness mm

<6.0 6.0~<8.0 8.0~<14.0 1.6~<2.0 2.0~<2.5 2.5~<3.15 3.15~<4.0 4.0~<6.3 ≥6.3 <2.0 ≥2.0

SAPH310d ≥310 ≥185 ≥175 ≥33 ≥34 ≥36 ≥38 ≥40 ≥26 0a

SAPH370 ≥370 ≥225 ≥215 ≥32 ≥33 ≥35 ≥36 ≥37 ≥25 1a 2a

SAPH400 ≥400 ≥255 ≥235 ≥31 ≥32 ≥34 ≥35 ≥36 ≥24
2a
SAPH440 ≥440 ≥305 ≥295 ≥275 ≥29 ≥30 ≥32 ≥33 ≥34 ≥22 3a

a) Tensile test specimen specified value applies to vertical; on the tensile test to take L0 = 50mm, b = 25mm samples, that is, GB
/ T 228 in the P14 sample.。
b) Bending test specimen specified value applies to lateral bending specimen width b ≥ 20mm, the arbitration test sample width is
20mm
c )Yield is not obvious, the use of Rp0.2.
d) Grades SAPH 310 of the lower yield strength as the reference value, not as a guarantee conditions

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Table5

Tensile testa

Elongation% 180 diameter

of the bending
trademark The yield center of
Tensile strength L0=80mm,b=20mm L0=5.65 S
strengthc bending
MPa
MPa Nominal Thickness mm testa,b
<3.0 ≥3.0

QstE340TM ≥340 420~540 ≥19 ≥25

QstE380TM ≥380 450`590 ≥18 ≥23 0.5a

QstE420TM ≥420 480~620 ≥16 ≥21

QstE460TM ≥460 520~670 ≥14 ≥19

1a
QstE500TMd ≥500 550~700 ≥12 ≥17

a Tensile test requirements listed in the table values apply to longitudinal samples, the bending test provides values apply to

transverse samples

b Bend specimen width b ≥ 20mm, when the arbitration test 20mm.

c Yield is not obvious, the use of Rp0.2.

d Grade QStE500TM thicker than 8.0mm of steel sheet and strip, the allowed minimum yield strength decreased 20Mpa.

Table 6
trademark Tensile testa 180 diameter of
Lower yield Tensile strength Yield ratio Elongation% the bending
c
strength MPa L0 = 5.65 S center of
MPa bending testb

B330CL ≥225 330~430 - ≥33 0.5a

B380CL Thickness of 2.7 to 380~480 - ≥32 0.5a

5.5, ≥ 260

Thickness> 5.5 ~ - ≥28 1a

10.0, ≥ 235

Thickness of> 10.0 - ≥25

~ 14.0 hours, ≥

220

B420CL ≥290 420~520 - ≥28 0.5a

B440QZR ≥320 440~570 - ≥25 1a

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B480QZR ≥355 480~580 - ≥21

B320L ≥215 320~420 - ≥27 0a

B420L ≥305 420~540 - ≥25 0.5a

B510L ≥355 510~610 - ≥24 0.5a

B510DL ≥355 510~610 ≤0.80 ≥24 1a

B550L ≥400 550~650 - ≥23 1a

a Tensile test specimen specified value applies to horizontal;

b Bending test specimen specified value applies to horizontal. Grades B440QZR, B480QZR bending specimen width b ≥ 20mm,

arbitration bend test specimen width of 20mm; other brands of bending specimen width b ≥ 35mm, the arbitration test sample

width is 35mm

c Yield is not obvious, the use of Rp0.2.

d Grades B380CL, thickness ≥ 10.0mm of steel sheet and strip, the tensile strength to allow lower minimum 10MPa

Table7
Tensile testa
180 diameter of the
L0 = 50mm b = 25mm
trademark bending center of
Lower yield strengthc Tensile strength Elongation
bending testb
MPa MPa %
B440QK (BQK440) ≥295 ≥440 ≥34 1a
a Longitudinal tensile test specimens taken.
b Take lateral bending test specimens bent specimen width b ≥ 20mm, when the arbitration test 20mm.
c Yield is not obvious, the use of Rp0.2.

6.5.2 After the bending test, the outer side of the specimen may not have visible cracks.

6.6 Surface quality

6.6.1 steel sheet and strip the surface may have cracks, scarring, folding, bubbles and inclusions on the use of

harmful defects, steel and steel

With not a stratification. On the surface of the steel sheet and strip pickling may not have parking spots.

6.6.2 under the surface quality of steel sheet and strip is divided into two, as shown in Table 8.

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Table 8

Level Surface treatments applied Feature

Surface to allow depth (or height) steel

plate thickness tolerance of not more
than half of the Ma, concave, scratches
Non-pickling surface
General level surface (FA) and other minor, localized defects, but
Acid surface
the steel sheet and strip shall be
guaranteed the minimum thickness
allowed.
Surface does not affect the shape of
allowed defects, such as minor scratches,
Higher surface (FB) Acid surface
minor indentations, minor pitting, slight
roll and color printing, etc

6.6.3 Duiyu strip, because there is no chance to remove defected part, so be permitted with a number of

unusual part, but defective portion may not exceed total volume of 6% Changdu.

7 Inspection and testing

7.1 The appearance of steel sheet and strip inspection with the naked eye.

7.2 The steel sheet and strip application of the appropriate size and shape measurement tool to check.

7.3 each batch of steel sheet and strip the required number of test items in the sample, sampling, test methods

should be consistent with the provisions of Table 9

7.4 Sampling frequency

7.4.1 Chemical composition analysis of the sampling frequency

By smelting furnace of the chemical composition analysis.

7.4.2 mechanical properties and processing properties of the sampling frequency

Steel sheet and strip shall be granted acceptance by the weight of each batch of not more than 70 tons of the

same heat number, the same grade, with the thickness of the specification, with the production

Form of steel or steel products formed.

Note: The supply and demand by the two sides could be another test batch to determine weight.

7.5 mechanical properties and processing properties of the sampling location

Specimens taken from plate or strip width of 1 / 4.

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Table9

code Pilot project Sample number, Sampling methods Test Method for

1 Chemical analysis 1 GB/T222 GB/T 223

2 Tensile test 1 GB/T 2975 GB/T 228

3 Bending test 1 GB/T 2975 GB/T 232

7.6 retesting

7.6.1 If a particular test results do not meet standard requirements, from the same batch and then take double

the amount of any of the specimens failed

Project retesting.

7.6.2 retesting results (including the pilot project required all the indicators) qualified, then the entire batch of

compliance. Retest results (including the Head all the required test indicators) fail even if there is an indicator,

then retest failed.

7.6.3 If retesting failed, they have been doing tests and test results can not be acceptance of substandard

single-piece, but the batch materials without making a single test

Piece by piece can be re-submitted to testing and acceptance.

8 Rules in rounding GB / T 8170 requirements.

9 packaging, marking and quality certification

9.1 The steel sheet and strip packaging, marking and certification requirements should be consistent with

Q/BQB300.

9.2 package weight should be consistent with the provisions of Table 10.

Table10

The following surface treatment modalities packaging weight t

Product category
Non-pickling surface Acid surface

Hot rolled steel strip ≤43.6 ≤15.0

Hot rolled steel plate ≤10.0 ≤10.0

Hot-rolled slit strip ≤43.6 -

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Appendix A

(Informative)

The standards and reference standards and national standard similar grade comparison table

Table A.1

EN10149－2：
EN149－2－80 SEW092－82 Q/BQB310－2003 GB3273－89
1995

QStE340TM QStE340TM － －

－ QStE380TM QStE380TM － －

FeE420TM QStE420TM QStE420TM S420MC －

－ QStE460TM QStE460TM S460MC －

－ QStE460TM QStE460TM S460MC －

－ QStE460TM QStE460TM S460MC －

Note 1: SEW092-82, EN149-2-80 tensile test specified in the sample taken horizontally.

Note 2: EN10149-2: 1995 set out to take the longitudinal tensile test specimen.

Table A.2

Q/BQB310-2003 JIS G3113-1990

SAPH 310 SAPH 310

SAPH 370 SAPH 370

SAPH 400 SAPH 400

SAPH 440,B440QK SAPH 440

Additional note:

The standard and JIS G3113-1990, SEW092-82 and EN10149-2: 1995 is non-equivalent.

The standard instead of Q / BQB 310-1999.

The main changes compared to the standard and Q/BQB310-1999 as follows:

- Normative references cited Q/BQB300-2003, Q/BQB301-2003, GB / T 8170-1987;

- An increase of surface treatment and surface quality level;

- Will BZJ311-1999 incorporated in this standard;

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- An increase of bending test specimen when the width of the arbitration;

- For pickling the surface of hot rolled steel sheet and strip, expanded thickness ≤ 6mm;

- Will be allowed with the defective part of the strip should not exceed the total length of each volume,

"8%" to "6%";

- Modify the mechanical properties and processing properties of the group approved the provisions of

regulations and retest.

The standard for the informative appendix appendix.

The standard manufacturing management from the Baoshan Iron & Steel Co., Ltd. Ministry.

The standard manufacturing management from the Department of Baoshan Iron & Steel Co., Ltd.

drafting.

Huang spent drafters of this standard.

This standard was first released in 1989, 1994, first revision, second revision 1999

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