H.K.D.H. Bhadeshia,
Phase Transformations Group,
Department of Materials Science and Metallurgy,
University of Cambridge,
Cambridge, U.K.
Added to MAP: August 1999.
To calculate the nitrogen concentration in submerged arc Y-joint type welds.
Language: | FORTRAN |
Product form: | Source code |
SUBROUTINE MAP_STEEL_NITY(C,SI,MN,NI,MO,CR,V,AL,TI,CO, & NB,TA,W,ZR,CU,NITPPM,NW,NP) DOUBLE PRECISION C,SI,MN,NI,MO,CR,V,AL,TI,CO,NB,TA,W,ZR,CU DOUBLE PRECISION NITPPM,NW,NP
MAP_STEEL_NITY calculates the nitrogen concentration in submerged arc Y-joint type welds for a welding current of 900 amperes. It is assumed that the nitrogen concentration in the weld follows Sievert's law, which relates the amount of nitrogen absorbed by the moulten weldment metal to the square root of the partial pressure of the nitrogen in the surrounding atmosphere [1]. The equation evaluated in this subroutine relates the absorbed nitrogen content, Nweld, to the mean nitrogen content (in ppm) of the wire and the plate, Nw and Np respectively, by the equation [2]:
where F is the activity coefficient of nitrogen in a low alloy steel. F is a measure of the effect of chemical composition on the ability of the weld to absorb nitrogen and is calculated from the concentrations of any alloying and trace elements present (C, Si, Mn, Ni, Mo, Cr, V, Al, Ti, Co, Nb, Ta, W, Zr and Cu) by calling subroutine MAP_STEEL_NITR. If the calculated nitrogen concentration NITPPM is less than zero, then it is set to zero.
None.
The typical error is ± 13 ppmw.
None.
DOUBLE PRECISION AL,TI,CO,NB,TA,W,ZR,CU DOUBLE PRECISION C,SI,MN,NI,MO,CR,V,NW,NP,NITPPM C WRITE(*,*) 'Input C, Si, Mn, Ni, Mo, Cr, V (wt%):' READ (*,*) C, SI, MN, NI, MO, CR, V WRITE(*,*) 'Input Al, Ti, Co, Nb, Ta, W, Zr, Cu (wt%):' READ (*,*) AL, TI, CO, NB, TA, W, ZR, CU WRITE(*,*) 'Input N in wire, N in plate (ppm):' READ (*,*) NW,NP CALL MAP_STEEL_NITY(C,SI,MN,NI,MO,CR,V,AL,TI,CO,NB,TA,W, & ZR,CU,NITPPM,NW,NP) WRITE (*,1) NITPPM STOP 1 FORMAT(//' Nitrogen content of weld = ',F7.2, ' ppm') END
Input C, Si, Mn, Ni, Mo, Cr, V (wt%): 0.05 0.5 1.0 0.0 0.0 0.5 0.0 Input Al, Ti, Co, Nb, Ta, W, Zr, Cu (wt%): 0.001 0.0 0.0 0.0 0.0 0.0 0.0 0.1 Input N in wire, N in plate (ppm): 100 60
Nitrogen content of weld = 75.49 ppm
Subroutines
MAP_STEEL_NITR
nitrogen, concentration, submerged arc Y-joint, weld
MAP originated from a joint project of the National Physical Laboratory and the University of Cambridge.
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