News
Cold Rolled Process of Bronze Sheet
2025-07-10
The process of cold-rolling bronze sheet is involving multiple precision steps. The core is to obtain the required thickness, surface quality, mechanical properties and dimensional accuracy of the sheet through rolling deformation at room temperature and intermediate heat treatment. Shanghai Nosinda Metal Co., Ltd is the leader in precision cold-rolled bronze sheet technology.
1. Raw Material Selection (choose the appropriate bronze alloy according to the final use)
♦ Tin bronze: such as C5191, C5111 with good elasticity and wear resistance.
♦ Aluminum bronze: such as C61900, C63000 with high strength, high wear resistance, corrosion resistance.
♦ Beryllium bronze: such as C17200 with extremely high strength, elasticity, electrical and thermal conductivity.
♦ Silicon bronze: such as C65500 with good strength, corrosion resistance, weldability.
|
Alloy |
Chemical Composition(%) |
|||||||||||||
|
UNS# |
JIS |
ISO |
Cu |
Pb |
Sn |
Zn |
Fe |
P |
Ni |
Al |
Mn |
Si |
Be |
Co |
|
C51100 |
C5111 |
CuSn4 |
Rem |
≤0.05 |
3.5–4.9 |
≤0.30 |
≤0.10 |
0.03–0.35 |
— |
— |
— |
— |
— |
— |
|
C51900 |
C5191 |
CuSn6 |
Rem |
≤0.05 |
5.0–7.0 |
≤0.30 |
≤0.10 |
0.03–0.35 |
— |
— |
— |
— |
— |
— |
|
C61900 |
C6191 |
CuAl10Fe3 |
Rem |
≤0.02 |
≤0.60 |
≤0.80 |
3.0-4.5 |
— |
— |
8.5-10 |
— |
— |
— |
— |
|
C63000 |
C6301 |
CuAl10Ni5Fe4 |
Rem |
— |
≤0.20 |
≤0.30 |
2.0-4.0 |
— |
4.0-5.5 |
9.0-11.0 |
≤1.5 |
≤0.25 |
— |
— |
|
C17200 |
C1720 |
CuBe2 |
Rem |
— |
— |
— |
— |
— |
— |
≤0.20 |
— |
≤0.20 |
1.8-2.0 |
≥0.20 |
|
C65500 |
— |
CuSi3Mn1 |
Rem |
≤0.05 |
— |
≤1.5 |
≤0.8 |
— |
≤0.6 |
— |
0.5-1.3 |
2.8-3.8 |
— |
— |
2. Core Cold Rolling Process
At room temperature, the rollers of the rolling machine are used to apply pressure to the plate, so that it passes through a gradually decreasing roller gap, undergoing plastic deformation, reducing thickness and increasing length.
3. Intermediate Annealing
When the accumulated work hardening of cold rolling causes the plasticity of the material to drop significantly, the rolling force is too large or the plate shape is difficult to control, intermediate annealing is required. The purpose is to eliminate the work hardening and restore the plasticity and ductility of the material so that the subsequent cold rolling can be continued or the required soft state performance can be achieved. Shanghai Nosinda Metal Co., Ltd has mastered the vacuum protection annealing technology and adopted the nitrogen protection annealing process. The temperature control accuracy is ±5℃, ensuring that the alloys such as tin bronze and beryllium bronze are completely recrystallized, the grain size uniformity is improved by 40%, the "orange peel" defect is eliminated, and the plasticity recovery rate is >99%.
4. Intermediate Pickling and Cleaning
If intermediate annealing is carried out under a non-protective atmosphere, oxide scale will form on the surface after annealing, and pickling, cleaning and drying must be carried out again to prepare for the next cold rolling or finished product annealing.
5. Finishing
After intermediate annealing and necessary pickling, the final finishing pass is carried out to achieve precise finished product thickness tolerance, good plate shape, and required surface finish and mechanical properties.
6. Heat Treatment
Final heat treatment is carried out according to the delivery condition required by the user (soft, semi-hard, hard temper, etc.)
7. Finishing
♦ Straightening: Use a roller straightening machine to eliminate the poor plate shape generated during rolling and heat treatment to ensure the straightness of the plate.
♦ Shearing/slitting: Cut wide coils or plates into long-length plates or slit into narrow strips according to order requirements.
♦ Surface treatment: Polishing, brushing, passivation, oiling, etc. may be performed according to customer requirements.
The cold-rolled bronze sheet procution process is a cyclic process of "rolling-hardening-soft annealing-rerolling". By precisely controlling the rolling parameters, annealing process, and auxiliary processes such as lubrication, pickling, and finishing, high-quality bronze sheets that meet various stringent requirements are finally produced. Stability and refined control of each step are the key to ensuring product quality and performance consistency.
If you have any questions or quotation requirements of bronze sheet, please contact us as below, and our engineering design team will immediately adopt a dedicated process to ensure that each customer makes the right choice in metal and manufacturing.
Contact Us
Web: www.nosindametal.com
Email: sales@nosindametal.com
Tel: +86 176 0133 0366
Add: Zone A, Floor 1, Building 104, No. 1-30, Lane 88, Minbei Road, Minhang District, Shanghai, China