Bethlehem Lukens Plate

Hardwear Steels

 
WELDABILITY
Figure 11: Welding Preheat Guide for Bethlehem's Hardwear* Plate
Table 1 Recommended Minimum Preheat (�F)
Combined Plate
Thickness: T1 + T2 + T3		 Hardwear 400F Hardwear 500F
Heat Input (KJ/inch) Heat Input (KJ/inch)
30 35 40 45 >45 30 35 40 45
3/4 inch 60 60 60 60 60 200 200 200 200
1 60 60 60 60 60 250 200 200 200
1 1/4 60 60 60 60 60 300 250 200 200
1 1/2 60 60 60 60 60 350 300 250 200
2 60 60 60 60 60 400 350 300 300
2 1/2 60 60 60 60 60 400 350 300 300
3 200 200 200 60 60 400 400 350 350
4 250 250 250 200 200 400 400 400 400
Table 2 Recommended Minimum Preheat (�F)
Individual Plate Thickness Hardwear 400F Hardwear 500F
Heat Input (KJ/inch) Heat Input (KJ/inch)
30 35 40 45 >45 30 35 40 45
1/2 inch 60 60 60 60 60 200 200 200 200
5/8 60 60 60 60 60 250 200 200 200
3/4 60 60 60 60 60 300 250 200 200
1 60 60 60 60 60 350 300 250 200
1 1/4 60 60 60 60 60 400 300 250 200
1 1/2 60 60 60 60 60 400 350 300 250
2 200 200 200 200 200 400 400 350 300

NOTES
  • Both tables must be consulted and the higher preheat value used.
  • Preheat temperature based on SMAW process and E7018 electrode.
  • E7018 electrodes must be stored in an over at 250� F � 25� F. Maximum exposure-4 hours out of the can or out of the oven.
  • Preheat minimum temperature may be reduced by 50� F (but not less than 50� F) using GMAW process, ER70S-3 electrode and AR-CO2 gas.
  • Maximum preheat should be 400� F to retain hardness properties.
  • 35 KJ/in represents approximately a 1/4 inch fillet weld (SMAW).

 

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