EN 12680-3-2003 锻造.超声波检验.第3部分球墨铸铁铸(2)
时间:2025-04-22
时间:2025-04-22
锻造.超声波检验
Founding—Ultrasonic examination—Part 3: Spheroidal graphite cast iron castings
铸件-超声波探伤-第三部分:球墨铸铁件
表1 可允许的最大不连续区域尺寸—缩孔
探伤级别
项目 单位
1 2 3 4 5
所探区域的壁厚
所占壁厚的百分比 边缘部位最大不连续
a,b
区域
中间部位最大不连续
区域
不连续区域总面积占所探区域的百分比
mm % mmmm
2
— — C C C
<50
50 to 200 20 1000 15000 15
>200 <50
50 to 200 25 2000 20000 20
>200 <50
50 to 200
30
— — 20
>200 <50 ≥50
35
— — 30
— — 30
— — 40
600 10000 10
1000 15000 15
1000 15000 15
2000 30000 20
— 20000 15
2
%
a 熔渣不连续区域尺寸参见表2; b 边缘部位见图1;
c 所测数据不得超过表4规定的极限数据。
Table 2 — Maximum permissible indicated dimensions of discontinuities — dross
Severity level
Feature
1 2 3 4
Percentage of wall
a 10 15 20
thickness in %
a No indications exceeding the limits given in Table 4.
表2 可允许的最大不连续区域尺寸—熔渣
项目
所占壁厚的百分比(%)
探伤级别
1 a
2 10
3 15
4 20
5 25
5 25
a 所测数据不得超过表4规定的极限数据。
Table 3 — Requirements for ultrasonic examination suitability
Dimensions in millimeters Wall thickness of the casting in Smallest flat-bottom hole diameter detectable according
the examined area to 5.2
> 10 to 20 3 > 20 to 100 5 > 100 to 250 8 > 250 to 500 10
表3 —超探适用性要求
铸件探伤区域的壁厚(mm) 可探最小平底孔直径(见5.2)
> 10 to 20 3 > 20 to 100 5 > 100 to 250 8 > 250 to 500 10
Wall thickness
of the casting in the examined area
(mm) > 10 to 20 > 20 to 100 > 100 to 250 > 250 to 500
Table 4 — Ultrasonic indications to be evaluated
Evaluation limits
reduction of backwall smallest flat-bottom
echo hole diameter detectable according to 5.2 min (dB) (mm) 12 3
5
20 8
10
echo height above noise levela
min (dB)
6 12
a Only for areas where no backwall echo is obtained to the casting geometry.
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