ASTM A387 Grade 911 Class 2 Steel Plate | A387 Gr.911 Cl.2 9Cr-1Mo-V Vessel Plate

ASTM A387 Grade 911 Class 2, also searched as A387 Gr.911 Cl.2, A387GR911CL2, A387GR911 CL2, A387-911 Cl.2, SA387 Grade 911 Class 2 and P911 plate, is the 9Cr-1Mo-1W-V-Nb grade buyers still call out under the A387 family. Nominal alloy is 9Cr-1Mo-1W-V. Grade 911 is Class 2 only. There is no Class 1. This page is not ASTM A387 Grade 91 Class 2. Grade 91 has no tungsten window. This page is not ASTM A387 Grade 9 Class 2. Grade 9 is 9Cr-1Mo without V, Nb or W.

Current ASTM A387/A387M notes that Grade 911, previously covered by A387, is now covered by ASTM A1017/A1017M. Inquiries still search A387 Gr.911 Cl.2 and SA387 Grade 911 Class 2. SHH STEEL will state the governing book on the certificate and will not pretend A387 still lists 911 if the mill issues A1017 / SA-1017.

Tensile is 90–120 ksi / 620–840 MPa. Yield is 64 ksi / 440 MPa min. Delivery is normalized and tempered. Annealed plate cannot be Grade 911. Typical austenitize is 1900–1975 °F / 1040–1080 °C. Typical temper is 1365–1435 °F / 740–780 °C. SHH STEEL is a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin). We buy this grade from qualified Chinese mills, check chemistry for W, V, Nb and N, and ship it to fabricators in the USA, Europe, Middle East, Southeast Asia, Africa and South America.

Related category pages: ASTM A387 and ASME SA387. Code dual-name pages include ASME SA387 Grade 911 Class 2 and ASME SA387 Grade 91 Class 2.

This plate sits in pressure vessel steel plates and ASTM A387. European 9Cr sisters belong on EN 10028-2.

Grade 911 is not Grade 91. The tungsten window is the first check.

Heat Analysis and Product Analysis — Grade 911 (9Cr-1Mo-1W-V-Nb)

Grade 91 has no 0.90–1.10% W requirement. Do not treat ASTM A387 Grade 91 Class 2 as 911. SHH STEEL prints heat analysis on every certificate, including W, V, Nb and N. Density is 7.85 g/cm³.

Buyers search A387 Gr.911 Cl.2 mechanical properties, A387GR911CL2 yield, P911 tensile and SA387 Grade 911 Class 2 tensile.

Tensile and Yield — Grade 911 Class 2

Grade 91 Class 2 is 585–760 MPa with 415 MPa yield. Do not quote Grade 91 numbers on a 911 order. Grade 911 is Class 2 only.

There is no official one-to-one worldwide swap for A387 Gr.911 Cl.2. What buyers compare is the P911 / 9Cr-1Mo-1W idea.

In the United States current plate work is ASTM A1017 Grade 911. Older drawings still say A387 Grade 911 Class 2 or ASME SA387 Grade 911 Class 2. ASTM A387 Grade 91 Class 2 is P91, not P911.

In Europe there is no daily EN 10028-2 twin written as 911. EN 10028-2 X10CrMoVNb9-1 is P91. That page sits on EN 10028-2.

In China buyers search 10Cr9MoW2VNbN-type comparisons. That is not an automatic A387 / A1017 substitute.

Dual marking is possible only when both books are fully met.

Buyers pick A387 Gr.911 Cl.2 when a file wants P911 / 9Cr-1Mo-1W-V-Nb at the 620–840 MPa table. Search phrases such as A387GR911CL2, A387 Grade 911 Class 2, SA387 Grade 911 Class 2 and P911 plate all point here.

It is not a substitute for ASTM A387 Grade 91 Class 2. That grade has no tungsten. It is not a substitute for ASTM A387 Grade 22 Class 2. That grade is 2.25Cr-1Mo.

SHH STEEL supplies this plate to fabricators in the United States, Mexico, South America, Europe, the Middle East, Africa and Asia.

A387 Grade 911 Class 2 is killed 9Cr-1Mo-1W-V-Nb vessel plate at 620–840 MPa. Treat welding as production welding, and as ASME Section I / Section VIII welding when the equipment is Code work.

Qualify to the applicable code. Consumables must match a P911 family. A procedure written for ASTM A387 Grade 91 Class 2 is P91, not P911. A procedure written for ASTM A387 Grade 9 Class 2 is 9Cr-1Mo without W/V/Nb. Preheat, interpass and PWHT must stay inside the qualified WPS. The fabricator owns the WPS. SHH STEEL can share mill heat data for that review.

Usual delivery from SHH STEEL for A387 Gr.911 Cl.2 is normalized and tempered. Typical austenitize is 1040–1080 °C. Typical temper is 740–780 °C.

Annealed plate cannot be Grade 911. If the mill only annealed the heat, it cannot be certified 911 Class 2.

If the vessel will see PWHT, say so. Simulated PWHT on test coupons is worth naming on P911 work. Extra simulation, 3.2 hold points or special NDE add time. Plan about two months when those extras are on the order.

The certificate lists A387 Grade 911 Class 2 and/or A1017 Grade 911 as applicable; heat number; heat analysis including W, V, Nb and N; tensile to the 911 Class 2 table; heat-treatment route. Certificates may be EN 10204 3.1 or EN 10204 3.2.

Usual supply range from SHH STEEL for A387 Gr.911 Cl.2 9Cr-1Mo-V vessel plate:

• Thickness: commonly 6 mm – 150 mm, thicker by mill agreement
• Width: 1500 mm – 4000 mm
• Length: 3000 mm – 12000 mm

Maximum thickness is limited by the ability of the composition to meet 911 Class 2 tensile. P91 plate belongs on ASTM A387 Grade 91 Class 2. 9Cr-1Mo plate belongs on ASTM A387 Grade 9 Class 2.

Dimensional limits for ASTM A387 Grade 911 Class 2 follow ASTM A20 / ASME SA-20 unless the purchase order names another table.

Typical thickness tolerance idea for A387 Gr.911 Cl.2 (A20 / SA-20 reference)

Width on 1500–4000 mm plate is commonly held to about ±20–25 mm unless the mill quote names a tighter extra. Length on 3000–12000 mm plate is commonly held to about +50 / 0 mm or ±25 mm by mill practice. Flatness follows A20 / SA-20 unless a tighter class is written. SHH STEEL will not assume a zero-minus extra on A387GR911CL2 unless the order says so.

Grade 911 Class 2 already defines chemistry, Class 2 tensile and N+T. Extra items still have to be written on the purchase order.

Current book name. Write A1017 Grade 911 when the mill will certify to the current ASTM plate spec.

Code name. Write SA-1017 Grade 911 or SA387 Grade 911 Class 2 only when that name is allowed on the job.

Heat-treatment route. Write normalized and tempered. Do not accept annealed plate.

Charpy details. Write temperature, joules, location and orientation if impact is required.

Simulated PWHT. Name hold temperature, hold time and cooling rate on the coupon.

Product analysis. Especially C, Cr, Mo, W, V, Nb, N, P and S.

Through-thickness / Z-test. Name Z15, Z25 or Z35 when needed.

NDE. A20 / SA-20 ultrasonic extras, ASTM A435 or ASTM A578 as named.

Hardness. Write max HB after heat treatment or after simulated PWHT if the file caps it.

Third-party witness. EN 10204 3.2 with SGS, TÜV, BV, ABS, CCS, DNV or the inspector named.

Identification and stamping. Heat number, grade A387 Grade 911 Class 2 / A1017 Grade 911, thickness and mill logo.

A387 Grade 911 Class 2 is the plate for a file that wants P911 / 9Cr-1Mo-1W-V-Nb. It is the wrong plate for P91. That work is ASTM A387 Grade 91 Class 2. It is the wrong plate for 2.25Cr-1Mo. That work is ASTM A387 Grade 22 Class 2.

SHH STEEL sources ASTM A387 Grade 911 Class 2 / A1017 Grade 911 from first-line Chinese mills and ships it on worldwide terms. Partner mills include Wuyang (Wugang), Angang, Shougang, Hanye, Anyang Iron & Steel, Baosteel, Xinyu, Xingcheng, Yongjin, Tsingshan, TISCO (Taiyuan), Jiuquan (JISCO), Lianzhong, Zhangpu and Baoxin, plus other qualified mills when the size or heat-treatment route requires it.

Mill test certificates are issued to EN 10204 3.1 as standard. EN 10204 3.2 is arranged when the order names a third-party hold point.

Usual stock and rolling thickness: 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 30 mm, 32 mm, 36 mm, 40 mm, 50 mm, 60 mm, 80 mm, 100 mm, thicker by mill agreement.

Processing: CNC or flame cutting, bevel, flattening, UT to the named class.

Trade terms: FOB Shanghai main, CIF destination available. Payment: TT, LC, or TT + LC.

Ocean time from Shanghai: US West 14–18 days; US Gulf 28–35 days; Rotterdam / Antwerp 28–35 days; Jebel Ali 18–25 days; Singapore 7–12 days; other ports quoted.

Third-party: SGS, TÜV, BV, ABS, CCS, GL, VL, DNV, RINA, NK, KR, or the inspector named.

SHH STEEL is a global steel mill sourcing partner with mill partnerships in China. We supply ASTM, ASME, EN, DIN, JIS and GB steel to buyers in the United States, Europe, the Middle East, Southeast Asia, Africa and South America. Origin is mill-direct, China origin.

SHH STEEL has supplied steel plates to the USA, Mexico, Argentina, Peru, El Salvador, Spain, Netherlands, Germany, UAE, Saudi Arabia, South Africa, India, Thailand, Singapore, Vietnam, the Philippines, Japan and Korea.

Typical lead time: ex-stock 5–7 days; standard rolling / N+T about 45–60 days; simulated PWHT / 3.2 about 2 months.

Experience on this grade is simple: keep tungsten on the certificate, keep 911 away from 91, and name A1017 when that is the current book. SHH STEEL as a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin) prices A387 Gr.911 Cl.2 / A1017 Grade 911 from first-line mills, reports 9Cr-1Mo-1W-V-Nb chemistry, records N+T delivery, and issues 3.1 as standard or 3.2 when specified.

We keep the grade on the order. A387GR911CL2 is not ASTM A387 Grade 91 Class 2. A387 Grade 911 Class 2 is not EN 10028-2 X10CrMoVNb9-1. If the drawing says Grade 91, we will not ship 911 and call 9Cr enough.

ASTM A387 Grade 911 Class 2 Steel Plate is 9Cr-1Mo-1W-V-Nb pressure-vessel plate at 620–840 MPa tensile and 440 MPa yield. Whether the inquiry says ASTM A387 Grade 911 Class 2, A387 Gr.911 Cl.2, A387GR911CL2, SA387 Grade 911 Class 2, P911 or A1017 Grade 911, SHH STEEL as a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin) supplies plate with 911 chemistry, Class 2 tensile, recorded N+T delivery, and EN 10204 3.1 or 3.2 certification.

SHH STEEL supplies ASTM A387 Grade 911 Class 2 / A387 Gr.911 Cl.2 9Cr-1Mo-V Vessel Plate to the USA, Mexico, South America, Europe, the Middle East, Africa and Asia for work that actually names this grade.

Contact SHH STEEL for mill rolling, stock inquiry, cutting, bevel, 3.2 inspection or a worldwide quotation.

ASTM A387 Grade 911 Class 2 Steel Plate, A387 Gr.911 Cl.2, A387GR911CL2, P911 plate, 9Cr-1Mo-W-V vessel plate, A387 Gr.911 Cl.2 supplier, SHH STEEL