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Subroutine MAP_STEEL_NITY

  1. Provenance of code.
  2. Purpose of code.
  3. Specification.
  4. Description of subroutine's operation.
  5. References.
  6. Parameter descriptions.
  7. Error indicators.
  8. Accuracy estimate.
  9. Any additional information.
  10. Example of code
  11. Auxiliary subroutines required.
  12. Keywords.
  13. Download source code.
  14. Links.

Provenance of Source Code

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.

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Purpose

To calculate the nitrogen concentration in submerged arc Y-joint type welds.

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Specification

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

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Description

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]:

Nweld(ppm) = 8.332 [ {(Nw+Np) / 2}1/2 ] / F

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.

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References

  1. J.F. Lancaster, 1987, Metallurgy of Welding, 4th edition, (Allen and Unwin: London), p60.
  2. H.K.D.H. Bhadeshia, L.-E. Svensson and B. Gretoft, 1988, Journal of Materials Science Letters, 7, 610-612.

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Parameters

Input parameters

C - real
C is the carbon concentration (weight percent).

SI - real
SI is the silicon concentration (weight percent).

MN - real
MN is the manganese concentration (weight percent).

NI - real
NI is the nickel concentration (weight percent).

MO - real
MO is the molybdenum concentration (weight percent).

CR - real
CR is the chromium concentration (weight percent).

V - real
V is the vanadium concentration (weight percent).

AL - real
AL is the dissolved aluminium (weight percent).

TI - real
TI is the dissolved titanium (weight percent).

CO - real
CO is the dissolved cobalt (weight percent).

NB - real
NB is the dissolved niobium (weight percent).

TA - real
TA is the dissolved tantalum (weight percent).

W - real
W is the dissolved tungsten (weight percent).

ZR - real
ZR is the dissolved zirconium (weight percent).

CU - real
CU is the dissolved copper (weight percent).

NW - real
NW is the nitrogen content of the wire (parts per million by weight).

NP - real
NP is the nitrogen content of the plate (parts per million by weight).

Output parameters

NITPPM - real
NITPPM is the nitrogen content of the weld metal (parts per million by weight).

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Error Indicators

None.

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Accuracy

The typical error is ± 13 ppmw.

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Further Comments

None.

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Example

1. Program text

      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

2. Program data

 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

3. Program results

 Nitrogen content of weld =   75.49 ppm

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Auxiliary Routines

Subroutines
MAP_STEEL_NITR

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Keywords

nitrogen, concentration, submerged arc Y-joint, weld

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Download

Download source code

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