Grade 钢种:
20NiCrMo4F
Standard 标准：
ISO DIN EN 683-17
1.
CHEMICAL COMPOSITION % 化学成份：
|
|
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Mo |
V |
|
min |
0.17 |
0.15 |
0.40 |
|
|
0.35 |
0.90 |
0.15 |
|
|
max |
0.23 |
0.40 |
0.70 |
0.035 |
0.035 |
0.65 |
1.20 |
0.25 |
|
2.
STEEL MAKING PROCESS 炼钢工艺：
a) Steel is melted in Electrical Arc Furnaces. 电弧炉冶炼
b) Vacuum degassing required. 真空脱气
c) Bottom poured ingots to be used. 底注钢锭
3.
MACROSTRUCTURE 宏观结构
· Internal defects on the transverse slice using hot hydrochloric acid macro etching should comply as per ASTM E381. 热盐酸宏观腐
蚀横切片内部缺陷按ASTM E381
· Macro structure shall conform to rating S-2, R-2, C-2. 宏观结构符合S-2 R-2 C-2
· The non metallic inclusion determination shall be in accordance with ASTM E45
(Method A) 非金属夹杂物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 表面质量
Surface cracks and defects on all rolled bars shall be detected using Eddy Current Testing Method. 表面裂纹及缺陷用磁粉探伤方法。
5.
MECHANICAL PROPERTIES 机械性能：
Mechanical properties required as per test piece
Test piece heat treatment : 试样热处理
|
HEAT |
RULING |
TENSILE |
YIELD |
ELONGATION |
IMPACT |
HARDNESS |
|
TREATED |
SECTION |
STRENGTH |
STRENGTH |
A% |
KCV |
HB |
|
CONDITION |
DIA MM |
RM MPA |
RE MPA |
|
|
|
|
Waiting fill in . If you supply the value will highly appreciate! |
6.
ULTRASONIC TESTING 超声波探伤
Ultrasonic testing results must comply with; 按照SEP1921 3Cc
a) SEP 1921 group 3 class Cc
7.
ID & MARKING 身份及标识
Each bar to be clearly identified with Heat/Cast number and Steel Grade.每根清楚的标记炉号及钢种
8.
SIZE AND TOLERANCE 规格及公差
|
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. 轧材直径50-250mm,锻材直径 100- 1000mm.
9.
STRAIGHTNESS AND ROUNDNESS平直度与圆度
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.不圆度不超过直径范围50%
10.
LENGTHS 长度
4 – 5.8 Meter lengths, special requirement can do 20 meters long.一般4-5.8米长，特殊要求可以做到20米长。
11.
TEST CERTIFICATE REQUIREMENTS材质书要求
Inspection certificate in accordance to EN 10204, Form 3.1B and must include the following;按照EN10204 3.1B格式包括以下内容 :
a) Steel grade. 钢号
b) Full chemical composition with Max and Min. permissible variations. 全部化学成份并带上下限范围。
c) Heat / Cast Number
(To be clearly stamped on Bar) 炉号并在头上打钢印
d) Bar diameter 直径
e) Contract Number 合同号
f) Ultrasonic testing must state –
OK 探伤结果必须合格
g) Clearly indicate Quench and Tempered condition.清楚的说明交淬回火状态
h) Mechanical properties shall indicate the following results according to EN10083机械性能
· 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.宏观结构
j) grain size shall be evaluated in accordance with ASTM E112晶粒度
