Web:www.welding-honest.com Whatsapp:+86 13252436578
The GER-N27L and GER-N27 we produce are both low-hydrogen sodium-coated low-temperature steel electrodes with a Ni content of 2.5%, which are often used for welding ASME SA-203 GrA/B and 09MnNiDR steels. The models of GER-N27L and GER-N27 currently implementing GB/T5117-2012 are E5015-N5 P/E5015-G P and E5515-N5 P respectively, which correspond to the grades of the "Welding Materials Product Handbook" published by Machinery Industry Press. For W707 and W707Ni, the physical and chemical properties of the deposited metal of the two electrodes are compared as follows.
|
Name |
Model |
Chemical components% |
|||||
|
C |
Mn |
Si |
Ni |
S |
P |
||
|
GER-N27L |
E5015-N5P/ E5015-GP (W707) |
≤0.05 |
≤1.25 |
≤0.50 |
2.00-2.75 |
≤0.03 |
≤0.03 |
|
GER-N27 |
E5515-C1 (W707Ni) |
≤0.12 |
≤1.25 |
≤0.60 |
2.00-2.75 |
≤0.03 |
≤0.03 |
|
Name |
Model |
Mechanical properties and diffusible hydrogen |
|||||
|
PWHT |
Rm (Mpa) |
Rel (Mpa) |
A (%) |
KV2 (j) |
H (mL/100g) |
||
|
GER-N27L |
E5015-N5P/ E5015-GP (W707) |
605 ±15℃*h |
≥490 |
≥390 |
≥22 |
-75℃ KV2≥27 |
≤5 |
|
GER-N27 |
E5515-C1 (W707Ni) |
≥540 |
≥440 |
≥17 |
-60℃ KV2≥27 |
||
It can be seen from the above table that the chemical composition C and Si of the deposited metal of GER-N27 (W707Ni) are slightly higher than those of GER-N27L (W707). Therefore, in terms of strength, GER-N27L (W707) belongs to the 490MPa grade electrode with low tensile strength. GER-N27 (W707Ni) is a level, and the impact performance of the corresponding GER-N27L (W707) is slightly better than GER-N27 (W707Ni), but in practical applications, GER-N27L (W707) and GER-N27 (W707Ni) impact The test is generally accepted according to the index of -70°C or -75°C.
① Before deslagging
② After deslagging
GER-N27L (W707) vertical fillet welding
① Before deslagging
② After deslagging
GER-N27 (W707Ni) vertical fillet welding
GER-N27L and GER-N27 have excellent all-position weldability when welding ASME SA-203 GrA/B or 09MnNiDR steel (as shown in the above figure for the formation of the vertical welding seam of the two electrodes), and it is generally recommended that the welding line energy should not exceed 35kJ /cm, in order to obtain an excellent structure dominated by acicular ferrite. When GER-N27L (W707) is applied to equipment that needs quenching and tempering heat treatment + annealing heat treatment, it is usually to obtain better low-temperature impact toughness, but it will lose some strength, and the tensile strength is generally lower than 500MPa; GER-N27L (W707) In addition to towers, it is also used in 09MnNiDR steel ethylene spherical tanks, while GER-N27 (W707Ni) is often used in low-temperature containers that only need annealing heat treatment. The following will give examples of the application and related performance of GER-N27L and GER-N27 .
|
Welding rods |
Device name |
Heat treatment and technical requirements |
Supply measured data |
|
GER-N27L (E5015-G) |
09MnNiDR shift gas absorption tower |
Normalizing 915±15℃*1.5h air cooling + tempering 645±15℃*2.5h air cooling+615±15℃*10h After the furnace cools down: Rel≥300MPa Rm≥440MPa A%≥23 -70℃KV2≥60J Hardness HV10≤220 |
Rel=347MPa Rm=462MPa A=37% -70℃KV2=255J Hardness HV10=151 |
|
GER-N27L (E5015-N5P) |
09MnNiDR Vinyl spherical tank |
580±15℃*4h After the furnace cools down: Rel≥390MPa Rm≥490MPa A%≥22 -70℃KV2≥54J |
Rel=456MPa Rm=538MPa A=27% -70℃KV2=139J |
|
GER-N27 (E5515-N5P) |
09MnNiDR cryogenic container |
Min PWHT: 590±15℃*3.5h After the furnace cools down: Max PWHT: PWHT590±15℃*16.5h Rel≥440MPa Rm≥540MPa A%≥17 -70℃KV2≥54J |
Min PWHT: Rel=477MPa Rm=570MPa A=26% -70℃KV2=108J |
|
Max PWHT: Rel=476MPa Rm=566MPa A=28.5% -70℃KV2=112J |
09MnNiDR absorption tower
09MnNiDR ethylene spherical tank
More information send to E-mail: export@welding-honest.com
Post time: Dec-30-2022