134 BUTTING TECHNOLOGY 5.4 Roughness measurement of surface Fig. 5.4_1: Radial grinding of outside surface + 10 0 μm – 10 + 10 0 μm – 10 + 10 0 μm – 10 Hot rolled parent metal (condition 1D acc. DIN EN 10088-2) R a = 3.79 μm R z = 21.16 μm R amax = 24.88 μm Cold rolled parent metal (condition 2B acc. DIN EN 10088-2) R a = 0.58 μm R z = 4.48 μm R amax = 5.20 μm Electropolished pipe (made from cold rolled raw materials) R a = 0.26 μm R z = 1.71 μm R amax = 2.40 μm Comparison of roughness measurement acc. to DIN EN ISO 4288
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5.4 Roughness measurement of surface - BUTTING · 2015. 1. 13. · Roughness measurement of surface 135 No guarantee for correctness Table 5.4_6: Inside and outside surface conditions
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134 BUTTING TECHNOLOGY
5.4 Roughness measurement of surface
Fig. 5.4_1: Radial grinding of outside surface
+ 10
0 µm
– 10
+ 10
0 µm
– 10
+ 10
0 µm
– 10
Hot rolled parent metal
(condition 1D acc. DIN EN 10088-2)
Ra = 3.79 µm
Rz = 21.16 µm
Ramax = 24.88 µm
Cold rolled parent metal
(condition 2B acc. DIN EN 10088-2)
Ra = 0.58 µm
Rz = 4.48 µm
Ramax = 5.20 µm
Electropolished pipe
(made from cold rolled raw materials)
Ra = 0.26 µm
Rz = 1.71 µm
Ramax = 2.40 µm
Comparison of roughness measurement acc. to DIN EN ISO 4288
Roughness measurement of surface 135135N
o gu
aran
tee
for
corr
ectn
ess
Table 5.4_6: Inside and outside surface conditions acc. to DIN 11866 (extract as per January 2008) – stainless steel pipes for chemical and pharmaceutical industry
Hygiene class
Surface condition (µm)
Ra Inside surface(axially and
radially)
Ra Inside weld(axially and
radially)
Outside
H1 < 1.60 < 3.20 Pickled or
bright annealed,
without special
requirements of
roughness
or ground Ra <
1.0 µm (axially)
H2 < 0.80 < 3.20
H3 < 0.80 < 0.80
H4 < 0.40 < 0.40
H5 < 0.25 < 0.25
Table 5.4_7: Surface conditions after radial external grinding
No
guar
ante
e fo
r co
rrec
tnes
sGritIndustrial grindingaverage roughness
Ra (µm)
Special requirementsaverage roughness
Ra (µm)
180 – 240 1.3 0.9
320 – 400 0.9 0.5
320 – 400 / poliert 0.5 0.3
Basic stainless steel pipes made from cold rolled raw materials,