4.3　Metal Reinforcing Fiber

4.3.1　Metal reinforcing fiber shall be in Cr-Ni stainless steel with chemical composition and physical properties in accordance with Table 4.3.1.And the following requirements shall also be satisfied:

1　Cr18-Ni8 grade shall be used if the fluid temperature is lower than or equal to 800℃；

2　Cr25-Ni20 grade shall be used if the fluid temperature is higher than 800℃.

Table 4.3.1　Chemical Composition and Physical Properties of Metal Reinforcing Fiber

Table 4.3.1（Continued）

4.3.2　Metal reinforcing fiber should be in segmental shape，the diameter of segmental metal reinforcing fiber should be 0.2 to 0.4mm，and the length of metal reinforcing fiber after formation should be 25 to30mm.And metal reinforcing fiber with crescent-shaped transverse profile may also be used，and its sizes shall be 0.2mm×1.0mm×25mm.

4.3.3　The amount of metal reinforcing fiber mixed into lining concrete per cubic meter should be 40 to 50 kg.

4.3.4　Metal reinforcing fiber shall not be stained with oil and dirt.