Grade 鋼種:
50CrMo4(1.7228)
Standard 標準：
EN10083-1
1.
CHEMICAL COMPOSITION % 化學成份：
|
|
C |
Si |
Mn |
Ni |
Cr |
Mo |
S |
P |
|
min |
0.46 |
|
0.50 |
|
0.90 |
0.15 |
|
|
|
max |
0.54 |
0.40 |
0.80 |
|
1.20 |
0.30 |
0.030 |
0.030 |
2.
STEEL MAKING PROCESS 煉鋼工藝：
a) Steel is melted in Electrical Arc Furnaces. 電弧爐冶煉
b) Vacuum degassing required. 真空脫氣
c) Bottom poured ingots to be used. 底注鋼錠
3.
MACROSTRUCTURE 宏觀結構
· Internal defects on the transverse slice using hot hydrochloric acid macro etching should comply as per ASTM E381. 熱鹽酸宏觀腐蝕橫切片內部缺陷按ASTM E381
· Macro structure shall conform to rating S-2, R-2, C-2. 宏觀結構符合S-2 R-2 C-2
· The non metallic inclusion determination shall be in accordance with ASTM E45
(Method A) 非金屬夾雜物SATM E45-95 方法A
· The grain size shall be in accordance to ASTM E 112-96 Specification and must exceed Grade 5. 晶粒度ASTM E112-96 5以上。
4.
SURFACE DEFECTS 表面質量
Surface cracks and defects on all rolled bars shall be detected using Eddy Current Testing Method. 表面裂紋及缺陷用磁粉探傷方法。
5.
MECHANICAL PROPERTIES 機械性能：
Mechanical properties required as per test piece
Test piece heat treatment : 試樣熱處理
|
HEAT |
RULING |
TENSILE |
YIELD |
ELONGATION |
IMPACT |
HARDNESS |
|
TREATED |
SECTION |
STRENGTH |
STRENGTH |
A% |
KCV |
HB |
|
CONDITION |
DIA MM |
RM MPA |
RE MPA |
|
|
|
|
T |
|
|
|
|
|
|
6.
ULTRASONIC TESTING 超聲波探傷
Ultrasonic testing results must comply with; 按照SEP1921 3Cc
a) SEP 1921 group 3 class Cc
7.
ID & MARKING 身份及標識
Each bar to be clearly identified with Heat/Cast number and Steel Grade.每根清楚的標記爐號及鋼種
8.
SIZE AND TOLERANCE 規格及公差
|
Diameter, mm |
|
Tolerance |
|
50 – 100 |
|
+ 1% |
|
105 – 220 |
|
+ 1,2% |
|
230 – 250 |
|
+ 2% |
|
260 – 450 |
|
+ 3% |
|
460 – 600 |
|
+ 3% |
Rolled bar dia 50-250mm, forged bar diameter 100-1000mm. 軋材直徑50-250mm,鍛材直徑 100- 1000mm.
9.
STRAIGHTNESS AND ROUNDNESS平直度與圓度
a) Straightness deviations shall be Max 2mm per 1 meter.直度≦2mm/米。
b) Out of round shall not exceed 50% of the range of diameter.不圓度不超過直徑范圍50%
10.
LENGTHS 長度
4 – 5.8 Meter lengths, special requirement can do 20 meters long.一般4-5.8米長，特殊要求可以做到20米長。
11.
TEST CERTIFICATE REQUIREMENTS材質書要求
Inspection certificate in accordance to EN 10204, Form 3.1B and must include the following;按照EN10204 3.1B格式包括以下內容 :
a) Steel grade. 鋼號
b) Full chemical composition with Max and Min. permissible variations. 全部化學成份并帶上下限范圍。
c) Heat / Cast Number
(To be clearly stamped on Bar) 爐號并在頭上打鋼印
d) Bar diameter 直徑
e) Contract Number 合同號
f) Ultrasonic testing must state –
OK 探傷結果必須合格
g) Clearly indicate Quench and Tempered condition.清楚的說明交淬回火狀態
h) Mechanical properties shall indicate the following results according to EN10083機械性能
· Hardness results achieved in BHN
· Tensile strength R
M MPA
· Yield strength R
E MPA
· Elongation A%
· Impact energy is to be tested on 3 V notch specimens
i) Macrostructure Test results to ASTM E 381 shall be reported in the Certificate.宏觀結構
j) grain size shall be evaluated in accordance with ASTM E112晶粒度
