Chemical Composition of Steel rebars for Resin Rock Bolt

1. Chemical composition of resin rock bolt rebar shall conform to Table 1.

Table 1 Chemical Composition

 Element 20MnSi 30MnSi
Percentage, % Tolerance Percentage, % Tolerance
+ - + -
C 0.17-0.23 0.02 0.02 0.27-0.34 0.02 0.02
Si 0.40-0.70 0.03 0.03 0.60-0.90 0.03 0.03
Mn 1.30-1.70 0.03 0.03 1.00-1.40 0.03 0.03
Cr ≤0.030 0.05 0.05 ≤0.25 0.05 0.05
Ni ≤0.030 0.05 0.05 ≤0.25 0.05 0.05
Cu ≤0.030 0.05 0.05 ≤0.25 0.05 0.05
S ≤0.045 0.005 ≤0.025 0.005
P ≤0.045 0.005 ≤0.030 0.005

 

 

2. Sampling method

Take a 20~30mm length sample from steel rebar, 2 pieces each heat.

 

3. Chemical Composition

3.1 Exam chemical composition by spectrograph and read the values.

3.2 Test report

Test report include:

a) Documents of Samples, Lab, date;

b) Test regulation;

c) Test results and descriptions;

d) abnormal phenomenon

e) potential factors which are not included in reference standards or regulations.


Post time: Dec-29-2018