自从2012年国家发布不锈钢管生产执行标准GB/T14976-2012以来，市场上销售的不锈钢管喷码一片混乱，2012版本和2002版本都有，好多用户都搞不懂新版本比旧版本都有什么地方改变。下面我们通过对比来详细的分析一下。
 GB/T14976-2012本标准参照ASTMA268/A269M《一般用途奥氏体不锈钢无缝管和焊接钢管》、ASTMA312/A312M《无缝、焊接和深度冷加工奥氏体不锈钢管》和ASTMA268/A268M《一般用途无缝和焊接铁素体和马氏体不锈钢管》的修订。主要目的还是与国际标准化接轨。因为中国加入了WTO世贸组织。

1、按GB/T20878-2007修改了钢的牌号和化学成分：下面我们来看表一
组织类型 序
号 牌号 化学成分（质量分数）/%
C Si Mn P S Ni Cr Mo Ti 其他
奥
氏
体
型
不
锈
钢 1 0Cr18Ni9 ≤0.07 ≤1.00 ≤2.00 ≤0.035 ≤0.03 8.0~11.0 17.0~19.0  
2 1Cr18Ni9 ≤0.15 ≤1.00 ≤2.00 ≤0.035 ≤0.03 8.0~10.0 17.0~19.0  
3 00Cr19Ni10 ≤0.03 ≤1.00 ≤2.00 ≤0.035 ≤0.03 8.0~12.0 18.0~20.0  
4 0Cr18Ni10Ti ≤0.08 ≤1.00 ≤2.00 ≤0.035 ≤0.03 9.0~12.0 17.0~19.0 ≥5C%  
5 0Cr18Ni11Nb ≤0.08 ≤1.00 ≤2.00 ≤0.035 ≤0.03 9.0~13.0 17.0~19.0 Nb≥10C%
6 0Cr17Ni12Mo2 ≤0.08 ≤1.00 ≤2.00 ≤0.035 ≤0.03 10.0~14.0 16.0~18.5 2.0~3.0  
7 00Cr17Ni14Mo2 ≤0.03 ≤1.00 ≤2.00 ≤0.035 ≤0.03 12.0~15.0 16.0~18.0 2.0~3.0  
8 0Cr18Ni12Mo2Ti ≤0.08 ≤1.00 ≤2.00 ≤0.035 ≤0.03 11.0~14.0 16.0~19.0 1.8~2.5 5C%~0.7  
9 1Cr18Ni12Mo2Ti ≤0.12 ≤1.00 ≤2.00 ≤0.035 ≤0.03 11.0~14.0 16.0~19.0 1.8~2.5 5(C%-0.02)~0.8  
10 0Cr18Ni12Mo3Ti ≤0.08 ≤1.00 ≤2.00 ≤0.035 ≤0.03 11.0~14.0 16.0~19.0 2.5~3.5 5C%~0.7  
11 1Cr18Ni12Mo2Ti ≤0.12 ≤1.00 ≤2.00 ≤0.035 ≤0.03 11.0~14.0 16.0~19.0 2.5~3.5 5(C%-0.02)~0.8  
12 1Cr18Ni9Ti ≤0.12 ≤1.00 ≤2.00 ≤0.035 ≤0.03 8.0~11.0 17.0~19.0 5(C%-0.02)~0.8  
13 0Cr19Ni13Mo3 ≤0.08 ≤1.00 ≤2.00 ≤0.035 ≤0.03 11.0~15.0 18.0~20.0 3.0~4.0  
14 00Cr19Ni13Mo3 ≤0.03 ≤1.00 ≤2.00 ≤0.035 ≤0.03 11.0~15.0 18.0~20.0 3.0~4.0  
15 00Cr18Ni10N ≤0.03 ≤1.00 ≤2.00 ≤0.035 ≤0.03 8.5~11.5 17.0~19.0 N:0.12~0.22
16 0Cr19Ni9N ≤0.08 ≤1.00 ≤2.00 ≤0.035 ≤0.03 7.0~10.5 18.0~20.0 N:0.10~0.25
17 0Cr19Ni10NbN ≤0.08 ≤1.00 ≤2.00 ≤0.035 ≤0.03 7.5~10.5 18.0~20.0 Nb≤0.15
N:0.15~0.30
18 0Cr23Ni13 ≤0.08 ≤1.00 ≤2.00 ≤0.035 ≤0.03 12.0~15.0 22.0~24.0  
19 0Cr25Ni20 ≤0.08 ≤1.00 ≤2.00 ≤0.035 ≤0.03 19.0~22.0 24.0~26.0  
20 00Cr17Ni13Mo2N ≤0.03 ≤1.00 ≤2.00 ≤0.035 ≤0.03 11.0~14.5 16.0~18.5 2.0~3.0 0.12~0.22
21 0Cr17Ni12Mo2N ≤0.08 ≤1.00 ≤2.00 ≤0.035 ≤0.03 10.0~14.0 16.0~18.0 2.0~3.0 0.10~0.22
22 0Cr18Ni12Mo2Cu2 ≤0.08 ≤1.00 ≤2.00 ≤0.035 ≤0.03 10.0~14.5 17.0~19.0 1.2~2.75 Cu:1.0~2.5
23 00Cr18Ni14Mo2Cu2 ≤0.03 ≤1.00 ≤2.00 ≤0.035 ≤0.03 12.0~16.0 17.0~19.0 1.2~2.75 Cu:1.0~2.5
铁素体型 24 1Cr17 ≤0.12 ≤0.75 ≤1.00 ≤0.035 ≤0.03 * 16.0~18.0  
马氏体型 25 0Cr13 ≤0.08 ≤1.00 ≤1.00 ≤0.035 ≤0.03 * 11.5~13.5  
奥-铁
双相钢 26 0Cr26Ni5Mo2 ≤0.08 ≤1.00 ≤1.50 ≤0.035 ≤0.03 3.0~6.0 23.0~28.0 1.0~3.0  
27 00Cr18Ni5Mo3Si2 ≤0.03 1.3~2.0 1.0~2.0 ≤0.035 ≤0.03 4.5~5.5 18.0~19.5 2.5~3.0  

看看新表比较一下得知
GB/T14976-2002标准 GB/T14976-2012标准  
奥氏体型 序号 2002牌号 增加统一代号 2012新牌号 主要变化
  1 1Cr18Ni9 S30210 12Cr18Ni9  
  2 0Cr18Ni9 S30408 06Cr19Ni10 铬元素增加了一个
  3 00Cr18Ni10 S30403 022Cr19Ni10  
  4 0Cr19Ni9N S30458 06Cr19Ni10N  
  5 0Cr19Ni10NbN S30478 06Cr19Ni10NbN  
  6 00Cr18Ni10N S30453 022Cr19Ni10N  
  7 0Cr23Ni13 S30908 06Cr23Ni13  
  8 0Cr25Ni20 S31008 06Cr25Ni20  
  9 0Cr17Ni12Mo2 S31608 06Cr17Ni12Mo2  
  10 00Cr17Ni14Mo2 S31603 022Cr17Ni12Mo2 镍元素统一为12个
  11 S31609 07Cr17Ni12Mo2  
  12 0Cr17Ni12Mo2Ti S31668 06Cr17Ni12Mo2Ti  
  13 0Cr17Ni12Mo3N S31658 06Cr17Ni12Mo3N  
  14 00Cr17Ni12Mo3N S31653 022Cr17Ni12Mo3N  
  15 0Cr18Ni12Mo2Cu2 S31688 06Cr18Ni12Mo2Cu2  
  16 00Cr18Ni14Mo2Cu2 S31683 022Cr18Ni14Mo2Cu2  
  17 0Cr19Ni13Mo3 S31708 06Cr19Ni13Mo3  
  18 00Cr19Ni13Mo3 S31703 022Cr19Ni13Mo3  
  19 0Cr18Ni10Ti S32168 06Cr18Ni11Ti 钛元素增加一个
  20 1Cr18Ni9Ti S32169 07Cr19Ni11Ti 钛元素增加一个
  21 0Cr18Ni11Nb S34778 06Cr18Ni11Nb  
  22 S34779 07Cr18Ni12Nb  
  23 S11348 06Cr13AI  
  24 S11363 022Cr11Ti  
  25 S11510 10Cr15  
铁素体 26 1Cr17 S11710 10Cr17  
  27 S11863 022Cr18Ti  
  28 S11972 019Cr19Mo2NbTi  
马氏体 29 S40310 06Cr13  
  30 S41010 12Cr13  
  31 S42020 20Cr13